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“We will rebuild things that should not be rebuilt and … in ways that are less safe and secure than they should be,” Eli Lehrer, president of the DC free-market think tank R Street Institute, told Business Insider.

Shana Udvardy, a climate preparedness specialist at the Union of Concerned Scientists, said it would be a “grave mistake” to rebuild in Texas without taking into consideration the increasing occurrence and severity of major storms. She added that the federal government will lag behind some 600 towns and cities that have already implemented requirements to build between one and three feet above the 100-year flood level.

Lehrer called Trump’s decision to revoke the standards “the biggest step backwards that has ever been taken in flood management policy” and said the move will waste untold amounts of taxpayer money, harm the environment, and cost lives.

He and others argue that Trump’s decision was a politically motivated attempt to undo President Barack Obama’s climate change legacy.

“If the Obama administration had simply described this as a sensible taxpayer protecting land-use measure, the regulations would still be in effect,” Lehrer said.

And some Republican lawmakers have denounced the move.

“This executive order is not fiscally conservative,” Rep. Carlos Curbelo, a Florida Republican, said in a statement. “It’s irresponsible and it will lead to taxpayer dollars being wasted on projects that may not be built to endure the flooding we are already seeing and know is only going to get worse.”

The Obama administration estimated that the regulations would increase building costs by 0.25% to 1.25%, but would save taxpayers significant costs in the future. Studies show that for every $1 spent on disaster mitigation, the government will save $4 on post-disaster aid.

Joel Scata, an attorney with the Natural Resources Defense Council, told Business Insider that the regulations were in part spurred by the enormous costs of the disaster relief efforts following Hurricane Katrina in 2005 and Hurricane Sandy in 2012.

“This not only would have protected people and property from future flood events, but also was really meant to reduce the amount of disaster aid we spend on recovery,” he said.

And while Trump justified the rollback as part of an attempt to streamline and speed up construction projects, Lehrer said the regulations’ impact on the construction process would have been “subtle and inexpensive” in large part, and that an insignificant number of projects would have been abandoned due to increased costs.

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