CFC's are disassociated by ultraviolet radiation in the stratosphere. They have small amounts of leisure time compared to Hunter-Gatherers. They support larger population densities than Hunter-Gatherers. They are limited by the natural capital of their local environment. The US has lost up to one-third of its original topsoil to erosion, yet crop yields have not declined.
Greenhouse gases emitted by human activity increase the amount of heat trapped by the atmosphere.
If the answer is true, shade in A on your answer sheet. If the answer is false, shade in B on your answer sheet. In the stratosphere, temperature increases as altitude increases. There are abundant exchanges between the troposphere and the nstratosphere. The effect of photosynthesis in the concentration of oxygen in the atmosphere is negligible.