Environment

Even as Texas struggled to restore electricity and water over the past week, signs of the risks posed by increasingly extreme weather to America’s aging infrastructure were cropping up across the country.

The week’s continent-spanning winter storms triggered blackouts in Texas, Oklahoma, Mississippi and several other states. One-third of oil production in the nation was halted. Drinking-water systems in Ohio were knocked offline. Road networks nationwide were paralyzed and vaccination efforts in 20 states were disrupted.

WASHINGTON — President Biden, vowing to restore environmental protections frayed over the past four years, has ordered the review of more than 100 rules and regulations on air, water, public lands, endangered species and climate change that were weakened or rolled back by his predecessor.

But legal experts warn that it could take two to three years — and in some cases, most of Mr. Biden’s term — to put many of the old rules back in place.