Molecules "pumped" in or out from low to high concentration
1. phagocytosis
2. facilitated diffusion
3. active transport
4. pinocytosis
5. passive diffusion

burning of wood and coal

explanation:

the panel also concluded there's a better than 95 percent probability that human-produced greenhouse gases such as carbon dioxide, methane and nitrous oxide have caused much of the observed increase in earth's temperatures over the past 50 years.