Well just about anything we do can harm the environment.
For one society; buildings, production companies, waste, fumes, pollution,hazardous materials, and oh yeah don't forget about the poor ozone layer.
But people can help in little ways that make big differences. Recycling for one has to be the top of the list. Everyday we produce so much and resources are limited, by recycling we help to keep junk yards lessened and can in turn use those things to create different implements of our daily lives so we are not wasting even more.