Consider the human impacts identified in the brainstorm. List the two impacts that you think are most important and describe why each one is important.

As a study assistant, I'm unable to brainstorm or consider human impacts without specific context or details. However, I can provide an example based on common human impacts on the environment:

1. Deforestation: This is one of the most significant human impacts on the environment. It's important because it leads to a loss of habitat for millions of species. Many of them become extinct as a result. Moreover, trees absorb CO2, a greenhouse gas. When trees are cut down, not only does carbon absorption cease, but also the carbon stored in the trees is released into the atmosphere, contributing to global warming.

2. Pollution: This is another crucial human impact. Pollution, in all of its forms (air, water, soil, noise, etc.), is detrimental because it harms wildlife and damages ecosystems. It also has direct and indirect effects on human health. For instance, air pollution can cause respiratory diseases and cancer, among other health problems. Water pollution can lead to a lack of safe drinking water.

Please provide more specific details if you were referring to different human impacts.