Medical entomology is focused upon insects and arthropods that impact human health. Many animal diseases can "jump species" and become a human health threat so Veterinary entomology is also included in this category. Medical entomology also includes scientific research on the behavior, ecology, and epidemiology of arthropod disease vectors, and involves a tremendous outreach to the public in the interest of public safety.

Medical Entomology, in other words, is medical science directly concerned with vectors that affect human and animal health.

There could be several causes for climate change. Rising concentration of carbon dioxide is the factor for climate change that we face today. Some human activities have also been identified as the primary causes of ongoing climate change, often referred to as global warming. Climate change is any significant long-term change of average weather of a region over a significant period of time. The potential future effects of global climate change include more frequent wildfires, longer periods of drought in some regions and an increase in the number, duration and intensity of tropical storms. Taken as a whole, the net damage costs of climate change are likely to be significant and to increase over time.

Vector-Borne diseases are caused by parasites, viruses and bacteria that are transmitted by mosquitoes, sand flies, triatomine bugs, black flies, ticks, tsetse flies, mites, snails and lice. Of all infectious diseases, vector-borne diseases account for around 17%. Infected arthropod species bite transmits vector-borne diseases.

Climate is only one of many factors influencing vector distribution and some factors such as habitat destruction, land use, pesticide application, and host density also contributes to Vector-borne Diseases. At present bite of infected mosquitoes, ticks and fleas have more than tripled.

The ecology of Vector-Borne Diseases is complex. In the tropical and sub-tropical regions of developing countries, Insect-borne diseases are mainly found.

The physical, social and psychological health of humans is affected directly and indirectly by environmental consequences of climate change, such as extreme heat waves, rising sea levels, changes in precipitation resulting in flooding and droughts, intense hurricanes, and degraded air quality etc. Every human is vulnerable to the health impacts associated with climate change. Changes in climate and climate variability particularly changes in weather extremes, affect Climate change, together with other natural and human-made health stressors, influences human health and disease in numerous ways. More people will likely be exposed to the effects of climate change in the next century even greater impacts in the future. People's health is already being harmed by climate change, and the magnitude of this harm is almost certain to get much worse if effective actions are not taken properly.

Food security and nutrition are affected by all dimensions of Climate change. Global food security, sustainable development and poverty eradication are the serious threat to Climate change. A world without hunger progress can be potentially interrupted by climate change. A robust and coherent global pattern impacts on crop productivity that could have consequences for food availability. Whole food systems stability may be at risk under climate change because of short-term variability in supply. climate change influences on food security. Due to Climate change's impacts on weather patterns will have adverse effects that will threaten food security. Climate change, which is disrupting weather patterns that farmers rely upon is also raising food insecurity to 821 million people worldwide.

Many of the marine species are affected by climate change include plankton which forms the basis of marine food chains. From warming waters and ocean acidification, marine life faces challenges. Warming waters alter the latitude and depth which harms certain species. Climate change effects on ocean life and ultimately, human life. Changes to the climate is brought by increasing levels of greenhouse gases in the atmosphere, which leads to changes in the oceans, including sea-level rise and ocean acidification, which will end up at risk for marine ecosystems and coastal communities. Oxygen levels in the deep ocean have reduced by warming, threatening marine life around the world.

Pollution and climate change are closely related. The main sources of CO2 emissions are the extraction and burning of fossil fuels. Climate change and pollution are linked to one another by our increasing use of fossil fuels, including coal, petroleum, and natural gas. According to the WHO, air pollution is closely associated with climate change and in particular, with global warming. Climate change might also affect human health by making our air less healthy to breathe. Drastic changes can lead to an increase in allergens and harmful air pollutants. Air pollution affects people of all ages and across all social classes throughout the world

One of the most important global environmental challenges is Climate change, with implications for food production, water supply, health, energy, etc. Climate change is considered to be the most significant challenge to achieving sustainable development, and it threatens to drag millions of people into grinding poverty. Although we are leading better lives than a decade ago, persistent poverty and hunger, as well as rapid urbanization, are challenging. Global emissions of greenhouse gases are rising. This is clearly not sustainable. But scientific knowledge about climate change is advancing rapidly which is a  positive note

Increase in temperatures, sea levels rising, and more frequent and intense extreme weather events are causing due to Global warming. Environmental and social changes caused by human emissions of greenhouse gases are the effects of global warming. Far-reaching, long-lasting and in many cases, devastating is expected to the consequences of global warming. There is an increase in average air temperatures near the surface of Earth over the past one to two centuries. Climate change affects all regions around the world. Sea levels are also rising due to the melting of Polar ice shields. The most evident effect of climate change can be clearly seen  in the increased temperatures

Oceanography undertakes extensive research in ocean sciences with a particular focus on the key ocean processes that affect the climate system. The last 4.5 Billion years the Earth's Climate is not static but has evolved over and continues to do so into the Anthropocene. Climate on the Earth is controlled by the interactions among atmosphere, ocean, and land surface. Temperatures rising can also directly affect the metabolism, life cycle, and behavior of marine species. Many marine species could get affected by climate change which alters the metabolism, life cycle, and behavior. Climate change will alter marine life and there is no doubt on it.

Climate change affects the living world through changes in ecosystems and biodiversity. Ecosystems diversity deals with the variations in ecosystems within a geographical location as well as the non-living things with which they interact, such as air, soil, water, and sunlight. Ecosystems bring vital services to society such as biodiversity conservation, protection and enrichment of soils, purification of water and air and reduction of natural disaster risks. Biodiversity is the variability among living organisms including terrestrial, marine, and other aquatic ecosystems and the ecological complexes.

Critical component of sustainable development is protecting and creating healthy environments. Sustainable health can be integrated into Environmental health as a prerequisite for sustainable development. Very little information exists on environmental health and their effects of climate change, pollution and other environmental factors that can-do harm people's health, livelihoods and lives. The longstanding link between the environment and health have led to a recognition of the need for sustainable development. Environmental sustainability is the rates of renewable resource harvest, pollution creation that can be continued indefinitely. It is furthermore defined as responsible interaction with the environment to avoid depletion or degradation of natural resources and allow for long-term environmental quality. To tackle the Earth’s problems, we have to commit ourselves to protect the world natural heritage

Weather forecasting is the application of science and technology to predict the state of the weather in an area with an assessment of atmospheric conditions for a given location and time. As much data as possible about the current state of the Temperature, humidity and wind are particularly collected for Weather forecasts. The forecast should reflect different possible uncertainty scenarios associated with every forecast. Climate scenarios are represented by the statistical behavior of the weather based on assumptions. Now excellent information about forecast uncertainty is provided by Computer models

Renewable energy is energy that is collected from renewable resources, which are naturally replenished. These resources are often also referred to as alternative or renewable energy. This includes sunlight, geothermal heat, wind, tides, water, and different types of biomass. This Energy can't be deplenished and is constantly recharged. Solar wind power is an alternative approach to producing clean, non-polluting energy and is considered as most generous renewable energy sources. Ocean waters create a vast store of kinetic energy. Ocean energy has the potential of providing a huge amount of renewable energy around the world.

Bioenergy and biofuels are recognized globally as crucial elements in the reduction of greenhouse gases for the acceleration of global warming and climate change. Bioenergy is renewable energy made from materials acquired from biological origin. Biomass is any organic matter which has deposited sunlight in the form of chemical energy. In its most exclusive sense, it is a synonym to biofuel, which is fuel obtained from biological sources. This is a common misbelief, as bioenergy is the energy cultivated from the biomass, as the biomass is the fuel and the bioenergy is the energy stored in the fuel.

Human ecology is an interdisciplinary study of the relationship between living organisms and humans with their natural, social, and built environments. The ecosystem is considered perceived in human ecology. Human Ecology combines the ideas and methods from several disciplines, including anthropology, sociology, biology, economic history and archaeology. Nature, speed and process of social change in societies always influence nature. Ecosystem functioning reflects the life activities of plants, animals, and microbes and these activities effects feeding, growing, moving, excreting waste, etc.

Nuclear power is the use of nuclear reactions that release nuclear energy to generate heat. Nuclear energy comes from splitting atoms in a reactor to heat water into steam, turn a turbine and generate electricity. Nuclear energy provides access to clean, reliable and affordable energy. The effect of nuclear is seen in every organism of the environment from bacteria to plant and to human beings. The damage it causes depends on the level of radiation and the resiliency of the organism. Radiation causes molecules to lose electrons thus destroying it. High doses of radiation can be devastating to the environment.

CO2 and other greenhouse gases act like a blanket, absorbing IR radiation and preventing it from escaping into outer space. The net effect is the gradual heating of the Earth's atmosphere and surface, a process known as global warming. A greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range. The primary greenhouse gases in Earth's atmosphere are water vapor, carbon dioxide, methane, nitrous oxide and ozone. Certain gases in the atmosphere block heat from escaping. Gases in the atmosphere such as carbon dioxide do what the roof of a greenhouse does. The greenhouse effect of Earth's atmosphere keeps some of the Sun's energy from escaping back into space at night.

Thermal pollution is the degradation of water quality by any process that changes ambient water temperature. A common cause of thermal pollution is the use of water as a coolant by power plants and industrial manufacturers. Many human and natural factors contribute to the problem of thermal pollution. The single biggest cause of thermal pollution is probably cooling for industrial machinery and power plants. Thermal pollution also has some natural causes.

Solving our climate change problems is the moral, economic, policy, political and technological challenge of our generation. This pollution is generated primarily by our region’s heavy concentration of old, highly polluting coal plants. But we can also be a fulcrum for solutions that make good economic and environmental sense. Clean renewable energy and energy efficiency policies, clean air implementation and enforcement, and clean transportation innovation. The shading reflects the number of relevant policies or pieces of legislation in each country. There are more than 1,500 climate laws and policies worldwide

The enormity of global warming can be daunting and dispiriting. Not all are right for everybody. Some you may already be doing or absolutely abhor. But implementing just a few of them could make a difference. Replacing fossil fuels may prove the great challenge of the 21st century. Reducing greenhouse gases is a potential last resort for addressing the challenge of climate change. Purchasing energy-efficient gadgets can also save both energy and money and thus prevent more greenhouse gas emissions.