According to Science and Public Policy Institute the cost is climbing and is of little or no benefit except to promote the idea of global warming. An excerpt:
The US Government has spent more than $79 billion of taxpayers’ money since 1989 on policies related to climate change, including science and technology research, administration, propaganda campaigns, foreign aid, and tax breaks. Most of this spending was unnecessary.
Despite the billions wasted, audits of the science are left to unpaid volunteers. A dedicated but largely uncoordinated grassroots movement of scientists has sprung up around the globe to test the integrity of “global warming” theory and to compete with a lavishly-funded, highlyorganized climate monopsony. Major errors have been exposed again and again.