✔ 最佳答案
- Global surface temperature increased 0.74°C (0.32 °F) during the past 100 years as of 2005. Not much, but still a change.
- Scientists predict that temperatures will rise another 1.1 to 2.4°C (2.0 to 4.4 °F) over the next 100 years.
- Over the last 40 years CO2 levels have increased from about 320 parts per million to about 370 parts per million.
- CO2 and CH4 have increased by 31% and 149% since the industrial age
- Although this is a VERY rough estimate with sketchy evidence; scientists believe that CO2 levels are the highest in 650,000 years.
- About 75% of global warming is believed to be caused by burning fossil fuels and the rest is because of livestock, deforestation, and other problems. However, this fluctuates greatly depending on the scientist.
- Some scientists believe that global warming is the result of an increase in solar radiation.