美国有线新闻 CNN 巴西溃坝事故已致150人遇难（在线收听）

We're starting today's show in the South American nation of Brazil, which is trying to come to grips with the worst mining disaster in its history.

We told you on January 28, how the collapse of a dam at an iron mine sent a flood of mining debris and mud into the city of Brumadinho. The number of people who died from the incident has risen to 150, and Brazil's government says at least 182 others are still missing.

Rescue officials do not think they're going to find any more survivors, according to the British Broadcasting Corporation. It also reports that Vale, the company that owns the mine says it followed recommended safety procedures. But this is the second mine owned by Vale where a dam has collapsed. The other incident happened in the same region in 2015, killing 19 people and polluting the environment.

And as the Reuters news organization reports, a Brazilian state official recently blamed the same problem for both disasters. Parts of the dam which was made of dried mud and sand turned into liquid, causing the structure to fail. In addition to the lives lost, the collapse contaminated a river downstream with mining debris, waste and toxins. And observers say the resulting pollution from that could indirectly impact millions.