Mexico

Millions of tons of sargassum wash up on beaches across North America every year. Exposure can lead to breathing problems, and it costs millions to clean it up.

Thousands lined up at the US-Mexico border anticipating the end of Title 42. However, the Biden administration rolled out new measures requiring migrants to apply online or seek protection in the country they passed through.

Mexico is rushing to complete a new train line around the Yucatan Peninsula that will link tourist resorts with cities and famous Maya sites. But large areas of tropical forest have been cut down, and activists say a unique network of sinkholes called cenotes are also at risk.