“I have advocated policies to promote renewable energy and accelerate reductions in global warming pollution for decades, including all of the time I was in public service,” Mr. Gore wrote. “As a private citizen, I have continued to advocate the same policies. Even though the vast majority of my business career has been in areas that do not involve renewable energy or global warming pollution reductions, I absolutely believe in investing in ways that are consistent with my values and beliefs. I encourage others to invest in the same way.”

Mr. Gore has invested a significant portion of the tens of millions of dollars he has earned since leaving government in 2001 in a broad array of environmentally friendly energy and technology business ventures, like carbon trading markets, solar cells and waterless urinals.

He has also given away millions more to finance the nonprofit he founded, the Alliance for Climate Protection, and to another group, the Climate Project, which trains people to present the slide show that was the basis of his documentary “An Inconvenient Truth.” Royalties from his new book on climate change, “Our Choice,” printed on 100 percent recycled paper, will go to the alliance, an aide said.

Other public figures, like Speaker Nancy Pelosi and Robert F. Kennedy Jr., who have vocally supported government financing of energy-saving technologies, have investments in alternative energy ventures. Some scientists and policy advocates also promote energy policies that personally enrich them.

As a private citizen, Mr. Gore does not have to disclose his income or assets, as he did in his years in Congress and the White House. When he left government in early 2001, he listed assets of less than $2 million, including homes in suburban Washington and in Tennessee.

Since then, his net worth has skyrocketed, helped by timely investments in Apple and Google, profits from books and his movie, and scores of speeches for which he can be paid more than $100,000, although he often speaks at no charge.

Image Former Vice President Al Gore, who has become a major voice around the world on the issue of climate change, spoke last month at a forum in Dubai. Credit... Marwan Naamani/Agence France-Presse — Getty Images

He is a founder of Generation Investment Management, based in London and run by David Blood, a former head of Goldman Sachs Asset Management (the firm was quickly dubbed Blood and Gore). Mr. Gore earns a partner’s salary at Kleiner Perkins. He has substantial personal finances invested at both firms, officials of the companies said.