News Analysis In speeches and executive orders, President Joseph Biden has made the reduction of carbon emissions a central focus, drawing strong support from the Sierra Club and other high-profile environmentalist organizations. Yet as the flow of illegal immigrants ratchets up and congressional Democrats push for mass amnesty for millions of illegal aliens through reconciliation, those groups have mostly remained silent about the environmental impact of open borders. This was not always the case: as recently as the 1989, the Sierra Club advocated controlled immigration levels in order to limit U.S. carbon dioxide emissions. In a report that year, it wrote that “immigration to the United States should be no greater than that which will permit achievement of population stabilization in the United States,” adding that “Sierra Club statements on immigration will always make the connection between immigration, population increase in the U.S., and the environmental consequences thereof.” By 2013, …