The Obama administration took a giant step forward on clean energy last year when it ordered the Export-Import Bank to stop funding coal plants abroad.  Unfortunately, the Senate is on the verge of undoing this progress by letting politics drive the Bank’s reauthorization this year.

The Senate is debating a provision from Sens. Joe ManchinJoseph (Joe) ManchinDems mull big changes after Brazile bombshell A bipartisan bridge opens between the House and Senate Collins, Manchin to serve as No Labels co-chairs MORE (D-W.Va.) and Mark KirkMark KirkHigh stakes as Trump heads to Hill Five things to watch for at Trump-Senate GOP meeting Giffords, Scalise highlight party differences on guns MORE (R-Iii.) that would allow the Bank to resume supporting the dirty energy projects that have decimated the environment and wreaked havoc on communities around the world.

Over the years, Ex-Im has permitted a coal plant in the middle of the Great Barrier Reef, another in India whose emissions were equal to a fifth of all US coal plants combined, and in possibly the most egregious case, a massive natural gas project in Papua New Guinea that evaded safety regulations, triggering a fatal landslide that killed 27 people.

Since President Obama took office, in fact, the Bank has ramped up its spending on fossil fuels, with funding soaring nearly five-fold since 2009. Outlays for renewables have barely budged during that time.

The Obama administration’s new policy last year seemed to signal an end to this dark era. It seemed only natural that the administration, which had begun tightening the screws on coal plants in the US, would do the same abroad. Many other investment banks around the world had already takensimilar actions, and it appeared the US was finally joining the global community in combating climate change.

Sadly, old habits die hard.

Mere weeks after the Ex-Im Bank issued its new rules, lawmakers were already calling for their rollback. In early 2014, House Republicans slipped a provision into their budget bill to allow fossil fuel funding in a wider group of developing nations, including India and Vietnam – site of the Bank’s most controversial projects.

The momentum has really picked up, though, with the recent debate over the Bank’s reauthorization. As the future of the Bank has become a hot topic on Capitol Hill, lawmakers are exploiting political divisions to push through their priorities.

Manchin – a longtime ally of the coal industry – has led the charge. Faced with the prospect of a battle among Senate Democrats over the Bank’s reauthorization, Manchin has decided to make his support contingent on a return to the Bank’s coal-filled past. His proposal would prevent the Bank from enforcing new energy guidelines for projects that would “increase exports of goods and services from the United States or prevent the loss of jobs in the United States.”

The Manchin proposal is highly misleading. Projects undertaken by the Ex-Im Bank are done so with the sole purpose of increasing United States exports. Manchin’s proposal would effectively prevent the Bank from enforcing clean energy rules for any project.

If Manchin is successful at putting his imprint on the Ex-Im Bank reauthorization, itssupport for dirty energy projects will be sanctioned once again and we will see many more environmental disasters like the ones in Australia and Papua New Guinea. Already, the Bank has hinted it may fund yet another massive coal plant in India.

It is disturbing that a routine vote such as this one could contain such dangerous consequences for the environment. It seems that lawmakers just cannot stop using the Ex-Im Bank to prop up the fossil fuel industry. If efforts like Manchin and Kirk’s continue, the role of the Ex-Im Bank must be seriously reexamined – for the long run. 

Lux is the co-founder of Democracy Partners and chair of American Family Voices.  Previously, he was Senior Vice President for Political Action at People For the American Way (PFAW), and the PFAW Foundation, and served in the Clinton White House from January 1993 to mid-1995 as a special assistant to the President for Public Liaison.