I have first degree in major biology minor chemistry and I have worked in regional environmental protection office;now I need free scholarship on fields of environment.

There are seldom free scholarships that cover all costs. Sometimes your work place may offer something. There are also work programs at times,
Have you contacted any specific university? Have you talked to any finical aid office?

What's wrong with getting student loans to pay for it... as was said... there are very few scholarships handed out... and they go to the most scholatically qualified applicants. (meaning the students who worked hardest to get the best grades and test scores). The rest borrow money to pay for it. Or they don't go.