While the adage is usually wielded in the context of changing habits for the better, it also applies here to Fortune’s annual Impact 20 list. Our annual Change the World list points to the giants of industry doing good with their dollars. By contrast, the Impact 20 points to relatively smaller venture-capital and private-equity-backed companies looking to improve lives as part of their business model—turning ESG and sustainability from buzzy terms into simple parts of everyday operations.

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When it comes to buying a used phone on the internet, it’s hard to be sure that you’re getting what you paid for. That’s the problem that French startup Back Market set out to solve in 2014. An online vertical marketplace for refurbished electronics like smartphones, tablets, and laptops, Back Market aims to make high-quality technology more accessible and sustainable—a vital service, as manufacturers like Apple hone their focus on making new products rather than on supporting the resale market.

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For seven years, Fortune has focused on companies working to address some of society’s thorniest problems in its annual Change the World list. And for five years, we have encouraged companies to maximize their social, as well as their financial, returns through our CEO Initiative. These are, for the most part, companies that have already achieved the scale to make a sizable difference.

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As interest in climate-tech grows, so are the mega war chests.

Growth equity and buyout investor TPG announced earlier this week that it had raised $5.4 billion to invest in climate solutions, while Canada’s Brookfield Asset Management followed up Tuesday by raising $7 billion upon the first close of its fund aimed at companies seeking to reach carbon neutrality.

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