McKibben lists two effects of climate change that humans are already experiencing. These effects include (check all that apply):
not going into swimming pools in public parks because they are filled with bugs
"not swimming in the ocean because jellyfish, who thrive in warm water because other marine life is killed, will bite"
not walking in meadows because ticks that carry Lyme disease could bite
using inordinate amounts of sunscreen because the burning sun has led to an increase in skin cancer