New York (CNN Business) Nearly 1,000 Amazon employees have pledged to walk out in protest of what they say is their company's inaction on climate change.

The collective known as "Amazon Employees for Climate Justice" posted a letter online Monday declaring that Amazon should lead on the issue because it's "one of the largest and most powerful companies in the world."

The walkout is scheduled for September 20, prior to the Global Climate Strike , a week-long international event that encourages employees to walk out from their workplaces to raise awareness.

Amazon employs around 600,000 people globally, so the group is small. However, it's making big demands.

For example, the group wants Amazon to stop donating to politicians and lobbyists who deny climate change. It also wants Amazon to stop awarding contracts to fossil fuel companies. And the group wants the company to test electric vehicles in cities that are most affected by the company's environmental impact. The group said it was "critical" for Amazon to emit zero emissions by 2030.

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