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Conservative billionaires used a secretive funding route to channel nearly $120m (77m) to more than 100 groups casting doubt about the science behind climate change, the Guardian has learned.

The funds, doled out between 2002 and 2010, helped build a vast network of thinktanks and activist groups working to a single purpose: to redefine climate change from neutral scientific fact to a highly polarising “wedge issue” for hardcore conservatives.

The millions were routed through two trusts, Donors Trust and the Donors Capital Fund, operating out of a generic town house in the northern Virginia suburbs of Washington DC. Donors Capital caters to those making donations of $1m or more.

Whitney Ball, chief executive of the Donors Trust told the Guardian that her organisation assured wealthy donors that their funds would never by diverted to liberal causes.

“We exist to help donors promote liberty which we understand to be limited government, personal responsibility, and free enterprise,” she said in an interview.

By definition that means none of the money is going to end up with groups like Greenpeace, she said. “It won’t be going to liberals.”

Ball won’t divulge names, but she said the stable of donors represents a wide range of opinion on the American right. Increasingly over the years, those conservative donors have been pushing funds towards organisations working to discredit climate science or block climate action.

Donors exhibit sharp differences of opinion on many issues, Ball said. They run the spectrum of conservative opinion, from social conservatives to libertarians. But in opposing mandatory cuts to greenhouse gas emissions, they found common ground.