Federal scientists studying Nevada’s Yucca Mountain say they have uncovered no environmental factors that would rule out the site as a future home for waste from nuclear power plants, according to a draft environmental impact statement released on Friday. Officials did, however, acknowledge “a substantial amount of uncertainty associated with estimates of long-term repository performance.” Critics of the proposed waste repository pointed out that it is in an earthquake-prone area and that moving waste to the site from nuclear plants around the country could endanger many communities. Numerous scientific questions still plague the nuclear waste storage plan.