Trump administration officials are altering the way costs and benefits of environmental and public health regulations are considered more broadly. One big example is sharply lowering estimates of a metric called the "social cost of carbon." Another is altering how regulators view "co-benefits." It's basically the way basically the way that rules aimed at one type of pollutant have beneficial health effects by cutting other dangerous emissions. University of Chicago economist Michael Greenstone, Lab co-director, says he sees “ a quiet revolution going on ... in the direction of making the environment less important."