WASHINGTON (AP) — President Joe Biden is undertaking what would be the most ambitious effort ever to cut America’s oil, gas and coal emissions and stave off the worst effects of climate change. New executive orders will target federal subsidies for those industries and halt new oil and gas leases on federal lands and waters. The orders awaiting his signature Wednesday aim to conserve 30 percent of the country’s lands and ocean waters in the next 10 years, move to an all-electric federal vehicle fleet and elevate climate change to a national security priority. The conservation plan would set aside millions of acres for recreation, wildlife and climate efforts by 2030.