Answer Happy

ents Question 21 1 pts The Earth's atmosphere currently has atmospheric CO₂ concentrations of 422ppmv. This means: Carbon dioxide is a major constituent of Earth's atmosphere For every 1000 parts air, about 420 of them are CO2 O For every 1 million parts air, about 420 parts are CO2 O We are currently breathing so much carbon that it will soon be harmful to us as humans Question 22 1 pts With regard to the Earth's greenhouse effect, which of the below accurately describes the role that greenhouse gases play in warming the Earth? The greenhouse gases act like a "blanket" over the Earth and trap all outgoing shortwave radiation The greenhouse gases absorb and reradiate longwave radiation The greenhouse gases reflect incoming shortwave radiation O The greenhouse gases reflect outgoing longwave radiation