We’ve all seen the horrific images of hundreds of innocent women burned or crushed to death in factories while making our clothes. In the next few days we can get companies to stop it happening again.

Big fashion brands source from hundreds of factories in Bangladesh. Two brands, including Calvin Klein, have signed a very strong building and fire safety pact. Others, led by Wal-Mart, have been trying to wriggle out of signing by creating a weak alternative that was pure PR. But the latest disaster has triggered crisis meetings and massive pressure to sign the strong version that can save lives.

Negotiations end in days. H&M and GAP are most likely to flip first to support a strong agreement, and the best way to press them is to go after their CEOs. If one million of us appeal directly to them in a petition, Facebook pages, tweets, and ads, their friends and families will all hear about it. They’ll know that their own and their companies’ reputations are on the line. People are being forced to make our clothing in outrageously dangerous buildings — sign on to make them safe, and forward this email widely.