NEW YORK -- With presidential candidates denying global warming is man-made , the drought in California , bees dying , and air pollution , we decided to check Quant Ratings for companies to buy in the environmental and facilities services, companies that deal with the effects humans have on their immediate environment. Regardless of who believes global warming is man made or what is causing California's drought, humans have an impact on the environment every day, and here are three companies that deal with these issues .