Climate change may prompt a new mass American migration, a move that could leave behind vulnerable groups and widen the wealth gap across the country

August besieged California with a heat unseen in generations. A surge in air conditioning broke the state's electrical grid, leaving a population already ravaged by the coronavirus to work remotely by the dim light of their cellphones. By mid-month, the state had recorded possibly the hottest temperature ever measured on earth — 130 degrees in Death Valley — and an otherworldly storm of lightning had cracked open the sky. From Santa Cruz to Lake Tahoe, thousands of bolts of electricity exploded down onto withered grasslands and forests...

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