It’s a preview of the not at all distant future, too.

The number of people migrating globally has steadily risen in the past two decades as poverty, climate change and violence have led people to flee their homelands.

Climate change is only going to get worse, much worse and very fast, so poverty and violence will get worse too, and migrations are going to accelerate, and resistance to migrations will accelerate too. People roasted to death in the backs of trucks will be an everyday occurrence.

The bodies of more than 40 people who appeared to have crossed into the United States illegally were found on Monday in one of the worst episodes of migrant deaths on the southern border in recent years. The journey north for migrants crossing into the U.S. from Mexico is typically dangerous, and sometimes fatal. Smugglers often transport large numbers in trailers, vans or S.U.V.s through remote areas in sweltering weather.

Desperation is a powerful force.