[The Bush] administration is ... proposing changes that would allow federal agencies to decide for themselves whether subdivisions, dams, highways and other projects have the potential to harm endangered animals and plants. Agencies also could not consider a project's contribution to global warming in their analysis. Environmentalists complained the proposals would gut protections for endangered animals and plants. Interior Secretary Dirk Kempthorne [said] the revisions ... were needed to ensure that the Endangered Species Act would not be used as a back door" to regulate the gases blamed for global warming. In May, the polar bear became the first species declared as threatened because of climate change. Warming temperatures are expected to melt the sea ice the bear depends on for survival. The rule changes ... would apply to any project a federal agency would fund, build or authorize that the agency itself determines is unlikely to harm endangered wildlife and their habitat. Government wildlife experts currently participate in tens of thousands of such reviews each year. The revisions also would limit which effects can be considered harmful and set a 60-day deadline for wildlife experts to evaluate a project. If no decision is made within 60 days, the project can move ahead. "If adopted, these changes would seriously weaken the safety net of habitat protections that we have relied upon to protect and recover endangered fish, wildlife and plants for the past 35 years," said John Kostyack, executive director of the National Wildlife Federation's Wildlife Conservation and Global Warming initiative.