Discuss the pros and cons of the various methods that have been proposed to regulate or control global warming?

For example, a method that has been used to regulate or control global warming is planting trees. The pros of planting trees is they serve as an absorber of carbon dioxide which helps the ozone layer get protected by the oxygen trees produce and they also regulate the temperature in the atmosphere although the cons are these trees can also catch fire eaaily due to the rising temperature in the atmosphere which can make them less effective in regulating the warming of the globe.

Ithink that the answer is b

What are the options? physical property can be color, smell, opacity, viscosity, density, infra red spectrum, melting and boiling points, attraction and repulson to magnets, etc.