A Liberal Democrat government would spend £100bn tackling the effects of climate change and protecting the environment, the party's deputy leader has announced.
Sir Ed Davey said the five-year investment would "jump-start" efforts to combat the "climate emergency".
The pledge would be funded through borrowing and tax changes, to be set out in detail in the party's manifesto.
The Conservatives and Labour both have targets to reduce carbon emissions.
Sir Ed, who served as secretary of state for energy and climate change in the coalition government, said his party would "decarbonise capitalism" if elected.
He said a Lib Dem administration would be a "government of business" by stopping Brexit, increasing investment in infrastructure, and promoting new green jobs.
Speaking in Leeds, he also pledged his party would build a new tram or metro system in the West Yorkshire city.
Sir Ed, who is also the party's finance spokesman, said the climate investment would include a new £10bn "renewable power fund" to leverage more than £100bn of extra private climate investment.
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