in 1991|left In 1986, Wirth
ran for the
U.S. Senate and won his party's nomination unopposed to replace Sen. Gary Hart. The general election was more difficult than expected, and he defeated fellow
U.S. Representative Ken Kramer by a narrow margin. In the Senate, he focused on environmental issues, particularly global climate change, and organized the historic Hansen hearings on climate change in 1988. At the hearings, Hansen testified that the Earth is warmer than at any other time in recent history, and that this can be attributed to human activity with 99% certainty. The hearings are widely credited with first bringing climate change into the public discourse. With his close friend, the late Senator
John Heinz (R-PA), he authored "Project 88", outlining the groundbreaking "Cap and Trade" idea which became law in the
Clean Air Act Amendments of 1990. He authored the far-reaching Colorado Wilderness Bill which became law in 1993, and with Senator
Alan Simpson (R-WY) he authored major legislation focused on population stabilization. Wirth also organized the Senate Task Force on the Expansion of Major League Baseball, which became a major factor in the awarding of a new expansion franchise to Denver. He chose not to run for re-election in
1992, citing in a front page cover story in the Sunday New York Times Magazine (August 9, 1992), frustration with the ever-increasing role of money in politics to the exclusion of focus on public policy.
After Congressional service 2011 Following two decades of elected politics, Wirth was national co-chair of the Clinton–Gore campaign, and served in the U.S. Department of State as the first
Undersecretary for Global Affairs from 1993 to 1997. He led U.S. foreign policy in the areas of refugees, population, environment, science, human rights and narcotics. He chaired the United States Delegation at the 1994 Cairo Conference on Population and Development, and was the lead U.S. negotiator for the
Kyoto Climate Conference until he resigned from the Administration in late 1997 to accept Ted Turner's invitation to be President of the newly created
United Nations Foundation. As President of the UN Foundation (UNF) from 1998 to 2013, Wirth organized and led the formulation of the Foundation's mission and program priorities, which include the environment, women and population, children's health, and peace, security and human rights. The Foundation also engages in extensive public advocacy, fundraising, and institutional strengthening efforts on behalf of the United Nations. By mobilizing these diverse resources, the UN Foundation works with many public and private partners and manages a variety of campaigns to help solve major problems facing the UN and the world community.
Work with the United Nations Foundation • Mobilizing resources in support of the eradication of polio with
Rotary International, the
Gates Foundation, and the
World Bank; • Initiating a global campaign to diminish the impact of measles with the
American Red Cross, the
Centers for Disease Control and UN Agencies; • Stimulating a nationwide grassroots program for the purchase of anti-malaria bed nets ("
Nothing But Nets") with many partners (including the
World Health Organization and the
National Basketball Association); • Organizing support for the special needs of adolescent girls within the UN and many private sector partners with
Nike and lead UN Agencies; • Supporting the
United Nations Population Fund, and working with Congress to increase U.S. funding and bring greater focus to AIDS prevention; • Developing standards for better managing tourism's impact on the environment and contribution to climate change in close partnership with
UNESCO and with
Expedia and other industry leaders; • Leading work to develop the UN framework for the post-Kyoto climate negotiations through a close partnership with the UN's leadership and retired heads of State throughout the world (
The Club of Madrid); • Managing a public-private effort with major segments of the agriculture community and UN agencies for better understanding of the promise, challenge and economics of bioenergy; and • Advancing aggressive standards for energy efficiency in the U.S. and abroad with the U.S.-centered Energy Future Coalition. The
University of Colorado at Denver has an endowed Tim Wirth Chair in Environmental and Community Development Policy. The current holder of the chair is the man Wirth replaced in the Senate,
Gary Hart. Wirth is a member of the ReFormers Caucus of
Issue One. In his retirement, Wirth has been supportive of the youth
climate justice movement. He has been active in efforts to convince his alma mater,
Harvard University, to divest from fossil fuels, and in March 2021 joined Harvard students, faculty, and alumni to file an official legal complaint charging that the university's fossil fuel investments were illegal under Massachusetts law. In response to the legal complaint and other efforts, Harvard committed to divestment from fossil fuels in the fall of 2021. == Personal life ==