Which of These Statements Is True Regarding Carbon Dioxide

Multiple Choice

Which of these statements is true regarding carbon dioxide?

A) CO₂ levels are now higher than any other time in the past 800 000 years in the Dome C ice core.
B) the rate of increase is lesser than any time in the last 20 000 years.
C) it is responsible for 0.4% of global warming.
D) global emissions in 2000 were 4% greater than in 1950,and the United States produced 24% of that total.
E) carbon dioxide has a signature smell and appears cloudy.