Climate Change the physical science

EPA(United States Environmental Protection Agency)

https://19january2017snapshot.epa.gov/climate-change-science/causes-climate-change_.html

Last update on December 27,2016

“Over the last several hundred thousand years, CO2 levels varied in tandem with the glacial cycles. During warm “interglacial” periods, CO2 levels were higher. During cool “glacial” periods, CO2 levels were lower.” CO2 levels have ranged over the last few hundred thousand years, in accordance with glacial cycles. CO2 levels were higher during the warm interglacial times. CO2 levels were lower during the warm glacial periods. “The most important GHGs directly emitted by humans include carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and several others. The sources and recent trends of these gases are detailed below.” Carbon dioxide ( CO2), methane ( CH4), nitrous oxide ( N2O), and numerous others are among the most critical GHGs straightforwardly delivered by people. The following are the depictions of the source and late improvements of these gases. “Nitrous oxide is produced through natural and human activities, mainly through agricultural activities and natural biological processes. Fuel burning and some other processes also create N2O. Concentrations of N2O have risen approximately 20% since the start of the Industrial Revolution, with a relatively rapid increase toward the end of the 20th century.” Through natural and human activities, nitrous oxide is produced, mainly through agricultural activities and natural biological processes. N2O is also formed by fuel burning and some other processes. Since the beginning of the Industrial Revolution, concentrations of N2O have increased by approximately 20%, with a relatively fast rise towards the end of the 20th century.

“Human activities currently release over 30 billion tons of CO2 into the atmosphere every year. The resultant build-up of CO2 in the atmosphere is like a tub filling with water, where more water flows from the faucet than the drain can take away.” Currently, human activities release more than 30 billion tons of CO2 annually into the atmosphere. The resulting CO2 build-up in the atmosphere is like a water-filled pool, where more water runs from the faucet than can be taken out by the drain. “The term albedo refers to the amount of solar radiation reflected from an object or surface, often expressed as a percentage. Earth as a whole has an albedo of about 30%, meaning that 70% of the sunlight that reaches the planet is absorbed.[3] Absorbed sunlight warms Earth’s land, water, and atmosphere.” The term albedo alludes to the sum, frequently communicated as a rate, of sun based radiation reflected from an item or surface. The Earth all in all has an albedo of around 30%, which implies that 70% of the daylight hitting the planet is absorbed.The Earth’s dirt, water, and environment are warmed by retained daylight.