Question

what do you mean by global warming ​

Answer 1

Answer:

Global warming is the gradual heating of Earth's surface, oceans and atmosphere. It is caused by human activity, primarily by the burning of fossil fuels that pump carbon dioxide (CO2), methane and other greenhouse gases into the atmosphere.

Answer 2

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The rising average temperature of Earth's climate system, called global warming, is driving changes in rainfall patterns, extreme weather, arrivals of seasons, and more. Collectively, global warming and its effects are known as climate change. While there have been prehistoric periods of climatic change, observed changes since the mid-20th century have been unprecedented in rate and scale.

The Intergovernmental Panel on Climate Change (IPCC) concluded that "human influence on climate has been the dominant cause of observed warming since the mid-20th century". These findings have been recognized by the national science academies of major nations and are not disputed by any scientific body of national or international standing.The largest human influence has been the emission of greenhouse gases, with over 90% of the impact from carbon dioxide and methane. Fossil fuel burning is the main source of these gases; agricultural emissions and deforestation are also important.

Temperature rise is enhanced by self-reinforcing climate feedbacks, such as loss of snow cover, increased water vapour, and melting permafrost.

Land surfaces are heating faster than the ocean surfaces, leading to heat waves, wildfires, and the expansion of deserts. Increasing atmospheric energy and rates of evaporation are causing more intense storms and weather extremes, damaging infrastructure and agriculture. Surface temperature increases are greatest in the Arctic and have contributed to the retreat of glaciers, permafrost, and sea ice.

Environmental impacts include the extinction or relocation of many species as their ecosystems change, most immediately in coral reefs, mountains, and the Arctic. Surface temperatures would stabilize and decline a little if emissions were cut off, but other impacts will continue for centuries, including rising sea levels from melting ice sheets, rising ocean temperatures, and ocean acidification from elevated levels of carbon dioxide.

Countries work together on climate change under the umbrella of the United Nations Framework Convention on Climate Change (UNFCCC), of which almost all countries are members. The goal of the convention is to "prevent dangerous anthropogenic interference with the climate system".

The IPCC has told policy makers that there is much greater risk to human and natural systems if warming goes above 1.5 °C (2.7 °F) compared to pre-industrial levels.Under the Paris Agreement, nations are making climate pledges to reduce greenhouse gas (GHG) emissions, but those promises — assuming nations follow through — would still allow global warming to reach about 2.8 °C (5.0 °F) by 2100.To limit warming to 1.5 °C (2.7 °F), methane emissions would need to decrease to near-zero levels and carbon dioxide emissions would need to reach net-zero by the year 2050.

The pancreas has both exocrine and endocrine functions. The pancreatic islet cell types include alpha cells, which produce glucagon; beta cells, which produce insulin; delta cells, which produce somatostatin; and PP cells, which produce pancreatic polypeptide.

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