Bernie Sanders Ad Attacks Amazon's Climate Change Policies.<br />The 2020 presidential candidate has been a frequent critic of the e-commerce giant.<br />The new video features two employees, Emily Cunningham and Maren Costa.<br />The women have made headlines for publicly speaking out against Amazon's climate change guidelines.<br />They also claim that Amazon threatened to fire them after they spoke to the press about the issue.<br />Amazon's workers are speaking out to say: Jeff Bezos should not be in the business of fossil fuel extraction. The company’s response? Retaliate with threats of firing. I stand with these employees who are fighting to protect the only home we have.<br />Cunningham and Costa both belong to advocacy group Amazon Employees for Climate Justice.<br />The group, along with Sanders in the ad, have pushed for the company to leave the fossil fuel industry behind.<br />Last year, Amazon released new goals that will make it more climate-friendly.<br />By 2030, one of them is to make the business rely entirely on renewable energy