"We know through high-accuracy instrumental measurements that there is an unprecedented increase in CO2 in the atmosphere. greenhouse gas emissions, according to an analysis from the Environmental Protection Agency (opens in new tab) (EPA). In 2016, CO2 accounted for 81.6% of all U.S.
At that time, the Arctic was ice-free for at least part of the year and significantly warmer than it is today, according to 2013 research published in the journal Science (opens in new tab).
That may not sound like much, but according to the Scripps Institution of Oceanography, levels of CO2 haven't been that high since the Pliocene epoch, from about 5.3 million to 2.6 million years ago.
ACCOUNTED SYNONYM FULL
As of 2020 (the last year when full data are available), the average CO2 in the atmosphere was 412.5 ppm, according to the National Centers for Environmental Information (opens in new tab). Between about 800,000 years ago and the beginning of the Industrial Revolution, CO2's presence in the atmosphere amounted to about 280 parts per million (ppm, meaning there were about 280 molecules of CO2 in the air per every million air molecules). Carbon dioxide is the most common greenhouse gas. Burning fossil fuels like coal and oil releases water vapor, carbon dioxide (CO2), methane (CH4), ozone and nitrous oxide (N2O), which are considered the primary greenhouse gases. Since the beginning of the Industrial Revolution, humans have been rapidly changing the balance of gases in the atmosphere. How greenhouse gases cause global warming In a paper presented in 1895, Arrhenius figured out that greenhouse gases such as carbon dioxide could trap heat close to the Earth's surface, and that small changes in the amount of those gases could make a big difference in how much heat is trapped. Gases in the atmosphere trap this heat, preventing it from escaping into the void of space (good news for life on the planet). Simply put, solar radiation hits Earth's surface and then bounces back toward the atmosphere as heat. That "smart guy" was Svante Arrhenius, a Swedish scientist and eventual recipient of a Nobel Prize in chemistry. Global warming is a synonym for climate change, though " climate change" has become the preferred term among scientists. The burning of fossil fuels has released greenhouse gases into the atmosphere, which trap warmth from the sun and drive up surface and air temperatures. Modern global warming is caused by humans.
In 2020, the average global temperature over land and ocean was 1.76 F (0.98 C) warmer than the 20th-century average of 57.0 F (13.9 C). The years 20 both came within fractions of degrees of knocking 2016 off its perch. So far, 2016 is the hottest year on record, but that record has been close to falling several times already. This has led to an overall 3.6 F (2 C) increase in global average temperature today compared with the preindustrial era.
Since 1981, the rate of increase has sped up, to 0.32 F (0.18 C) per decade. Here are the bare numbers, according to the National Oceanic and Atmospheric Administration (NOAA) (opens in new tab): Between 18, the global annual temperature increased at a rate of 0.13 degrees Fahrenheit (0.07 degrees Celsius) per decade, on average.
0 kommentar(er)
