"Carbon dioxide, the gas largely blamed for global warming, has reached record-high levels
in the atmosphere after growing at an accelerated pace in the past year..."
"Carbon dioxide, mostly from burning of coal, gasoline and other fossil fuels,
traps heat that otherwise would radiate into space."
"Global temperatures increased by about 1 degree Fahrenheit (0.6 degrees Celsius) during
the 20th century, and international panels of scientists sponsored by world governments
have concluded that most of the warming probably was due to greenhouse gases."