Photochemical smog is a Primary air pollutant Secondary air pollutan'tWhich of the following is NOT a risk associated with anthropogenic climate change? Increased coastal flooding Decreases in agricultural productivity in some regions Decreases in freshwater availability in some regions Reduced access to shipping lanes because of increases in sea ice Sea level riseWhich of the following is a greenhouse gas? Oxygen gas (O2) Methane (CH4) Nitrogen gas (N2) All of the aboveDeforestation leads to increases in atmospheric CO2 True FalseAir quality in Los Angeles has improved during the past 50 years. True False.