Thunberg tells lawmakers, "listen to the science."

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Greta Thunberg told the joint House committee hearing that she wants lawmakers to listen to and unite behind the science on climate change.

The young Swedish campaigner appeared before the House Foreign Affairs Subcommittee on Europe, Eurasia, Energy, and the Environment and the House Select Committee on the Climate Crisis Wednesday.

She submitted the Intergovernmental Panel on Climate Change Special Report on rising temperatures as her testimony.

Thunberg further made it clear to the panel that it's not about political opinion, the science is clear.