Question of the Week: Which presidents do you think did the most to protect the environment, and why?

Each week we ask a question related to the environment. Please let us know your thoughts as comments. Feel free to respond to earlier comments or post new ideas. Previous questions.

From Thomas Jefferson to Theodore Roosevelt to today, American presidents have worked, with considerable power and influence, to preserve and protect America’s environment and natural resources. February 16 is Presidents Day.

Which presidents do you think did the most to protect the environment, and why?