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Washington (CNN) — Greenhouse gas emissions pose a threat to public health and welfare, EPA Administrator Lisa Jackson said Monday.

“The overwhelming amount of scientific studies show that the threat is real,” she said.

The announcement stems from a Supreme Court ruling which ordered the agency to determine the impact of carbon emissions not only on the environment, but on public health.

iReport: Share your thoughts on climate change

“These long-overdue findings cement 2009’s place in history as the year when the United States government began addressing the challenge of greenhouse-gas pollution and seizing the opportunity of clean energy reform,” Jackson said.