According to a February 27, 2007 article in The Concord Monitor, "Gore was one of the first politicians to grasp the seriousness of climate change and to call for a reduction in emissions of carbon dioxide and other greenhouses gases. He held the first congressional hearings on the subject in the late 1970s."[61] During his tenure in Congress, Gore co-sponsored hearings on toxic waste in 1978?79, and hearings on global warming in the 1980s.[62] On 14 May 1989 while still a Senator, Gore published an editorial in the Washington Post which argued that, "Humankind has suddenly entered into a brand new relationship with the planet Earth. The world's forests are being destroyed; an enormous hole is opening in the ozone layer. Living species are dying at an unprecedented rate." [63]
On Earth Day 1994, Gore launched the GLOBE program, an education and science activity that, according to Forbes magazine, "made extensive use of the Internet to increase student awareness of their environment".[64]
In the late 1990s, Gore strongly pushed for the passage of the Kyoto Treaty, which called for reduction in greenhouse gas emissions.[65][66] He was opposed by the Senate, which passed unanimously (95-0) the Byrd-Hagel Resolution (S. Res. 98),[67] which stated the sense of the Senate was that the United States should not be a signatory to any protocol that did not include binding targets and timetables for developing as well as industrialized nations or "would result in serious harm to the economy of the United States".[68] On November 12, 1998, Gore symbolically signed the protocol. Both Gore and Senator Joseph Lieberman indicated that the protocol would not be acted upon in the Senate until there was participation by the developing nations.[69] The Clinton Administration never submitted the protocol to the Senate for ratification.
In recent years, Gore has remained busy traveling the world speaking and participating in events mainly aimed towards global warming awareness and prevention. His keynote presentation on global warming has received standing ovations, and he has presented it at least 1,000 times according to his monologue in An Inconvenient Truth. His speaking fee is $100,000.[70]
In 2004, he launched Generation Investment Management. This firm, which he chairs, seeks out companies which take a responsible view on global issues such as climate change. It was created to assist the growing demand for an investment style that can bring returns by blending traditional equity research with a focus on more intangible non-financial factors such as social and environmental responsibility and corporate governance.
Gore is a vocal proponent of carbon neutrality, buying a carbon offset each time he travels by aircraft.[71] Gore and his family drive hybrid vehicles.[72]
Interest in Al Gore's speeches reached such a point that a public lecture at University of Toronto on February 21, 2007, on the topic of global warming, led to a crash of the ticket sales website within minutes of opening.[73] A few weeks later, he spoke at another event in the same city and, for the first time, made the argument that employers have a significant role to play in mobilizing their employees to take action on climate change.[74]
During Global Warming Awareness Month, on February 9, 2007, Al Gore and Richard Branson announced the Virgin Earth Challenge, a competition offering a $25 million prize for the first person or organization to produce a viable design that results in the removal of atmospheric greenhouse gases.[75]
On July 7, 2007, Live Earth benefit concerts were held around the world in an effort to raise awareness about climate change. The event was the brainchild of both Gore and Kevin Wall of Save Our Selves.
Gore starred in the documentary film An Inconvenient Truth, which won the 2007 Academy Award for Documentary Feature.[76] The Oscar was awarded to director Davis Guggenheim, who asked Gore to join him and other members of the crew on stage. During this time, Gore gave a brief speech: "My fellow Americans, people all over the world, we need to solve the climate crisis. It's not a political issue; it's a moral issue. We have everything we need to get started, with the possible exception of the will to act. That's a renewable resource. Let's renew it."[77]
The film, released on May 24, 2006, documents the evidence for anthropogenic global warming and warns of the consequences of people not making immediate changes to their behavior. In late July, it surpassed Bowling for Columbine as the third-highest-grossing documentary in U.S. history.[78] Gore also published a book of the same title, which became a bestseller.