Question

does human cause climate change exist?

Answer 1

@coolman500 can you help me

Answer 2

Yes I can

Answer 3

The Earth's climate has changed throughout history. Just in the last 650,000 years there have been seven cycles of glacial advance and retreat, with the abrupt end of the last ice age about 7,000 years ago marking the beginning of the modern climate era — and of human civilization. Most of these climate changes are attributed to very small variations in Earth’s orbit that change the amount of solar energy our planet receives.

Answer 4

The US National Academies of Science, the National Aeronautics and Space Administration (NASA), and the National Oceanic and Atmospheric Administration (NOAA), and many others, say that greenhouse gas levels are rising due to human activities such as burning fossil fuels and deforestation which are causing significant climate changes including global warming, loss of sea ice, glacier retreat, more intense heat waves, stronger hurricanes, and more droughts. They contend that climate change requires immediate international action to prevent dire consequences.

The Heartland Institute, the Heritage Foundation, and the American Association of Petroleum Geologists, and many others, argue that human-generated greenhouse gas emissions are too small to substantially change the earth’s climate. They contend that our forests and oceans are capable of absorbing these small increases, and that 20th century warming has resulted from natural processes including fluctuations in the sun's heat and ocean currents. They say that global climate change is based on bunk science and scare tactics.

Human activities release greenhouse gases such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (NO2), into the atmosphere. As of Apr. 2010, CO2 levels were 389 parts per million (ppm) - reportedly higher than at any time in the last 650,000 years when levels fluctuated between 180 and 300 ppm. [3] This rise took place alongside a 20th century global temperature increase of between 1°F and 1.4°F.[1][43]

Although there was a period of cooling from 1940 to 1970 [2], and uncertainty exists in computer climate models, [8] many researchers think the earth will continue to warm by 3-10°F [1] over the 21st century.

Predictions about how climate changes will affect civilization range from an Oct. 2003 Department of Defense report [63] detailing catastrophic weather events and a "significant drop in the human carrying capacity of the Earth’s environment," to a Fall 2007 Oregon Institute of Science and Health report [19] detailing "an increasingly lush environment of plants and animals."

Answer 5

Scientists have know of the heating potential (greenhouse effect) of gases such as CO2 since at least Jan. of 1859, when British physicist John Tyndall first began experiments leading to the discovery that CO2 in the atmosphere absorbs the suns heat. [26]

On Feb. 16, 1938, engineer Guy S. Callender published an influential study [64] suggesting increased atmospheric CO2 from fossil fuel combustion was causing global warming. Many scientists criticized the study arguing that CO2 had a negligible effect on temperature compared to water vapor and atmospheric circulation changes.

In March 1958, US climate scientist Charles Keeling began measuring atmospheric CO2 at the Mauna Loa observatory in Hawaii for use in climate modeling. [27] Using these measurements, Keeling became the first scientist to confirm that atmospheric CO2 levels were rising rather than being fully absorbed by forests and oceans (carbon sinks). [28]

In 1977, the US National Academy of Sciences issued the report "Energy and Climate" [65] concluding that the burning of fossil fuels was increasing atmospheric CO2, and that increased CO2 was associated with a rise in global temperatures.

On June 23, 1988, National Aeronautics and Space Administration (NASA) scientist James Hansen presented testimony [66] to the US Senate stating directly that increases in CO2 were warming the planet and "changing our climate." The testimony was based on Hansen and colleagues' Aug. 1988 peer-reviewed study on Global Climate Change. [67] Many scientists, including MIT Meteorologist Richard Lindzen, [42] criticized Hansen's findings arguing that his climate models were unreliable, and that negative feedback loops [68] would balance out any warming caused by increased CO2.

Answer 6

does that help you

Answer 7

?

Answer 8

Yes, because think of global warming. Using cars and breathing releases carbon dioxide (CO2) Tree try to take it in, but human put so much out, it gets into the atmosphere. The bad thing is the CO2 traps heat. So when we use a lot of car and let out emission, we are making it hotter around the world :)

Answer 9

ok

Answer 10

and thanks for the medal

Answer 11

global warming