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Environmental groups are marking the 44th Earth Day on Tuesday with an assault on the Keystone XL pipeline, greenhouse gas emissions and other issues related to climate change.

Activists hope to use the day to press the case against Keystone, which they say would worsen climate change, while spotlighting the Environmental Protection Agency’s (EPA) upcoming rule to limit greenhouse gas emissions from existing power plants.

“It’s an opportunity for not only environmental groups but decision makers across the country to take stock of what we’re doing, but specifically what we’re not doing, because we’re losing ground in the fight against climate change,” said Bruce Hamilton, conservation director at the Sierra Club.

“And we’re not going to solve the problem if we keep incrementally approving another coal mine here, another KXL pipeline there. It’s just leading us down the wrong path.”