Not so quick, normy. Take this wiki entry FWIW:
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After joining the U.S. House of Representatives, Gore held the "first congressional hearings on the climate change, and co-sponsor[ed] hearings on toxic waste and global warming."[57][58] He continued to speak on the topic throughout the 1980s.[32][59][60] In 1990, Senator Gore presided over a three-day conference with legislators from over 42 countries which sought to create a Global Marshall Plan, "under which industrial nations would help less developed countries grow economically while still protecting the environment."[61]
************************************ http://en.wikipedia.org/wiki/Al_Gore
1990 was after 1988. At least on my calendar.