It's not expensive and hard, it's impossible. The largest carbon capture facility in the world is called mammoth, and in order to offset our current emissions we would need a million of them. We can not build a million of them.

This is why climate scientists have been saying for a hundred years that we need to stop producing all this CO2, because we can't take it back. We can't just fix it. We can't just get back all the ice that's melted and keeps melting, we can't unthaw the permafrost. We can't stop all the methane and other climate gases that have been trapped under ice for millions of years from being released and making it even worse. We just can not do it.

We were warned, we ignored the warnings and now we're seeing the consequences.

The earth doesn't die because CO2 levels increase. There have been multiple epoch with higher CO2 concentrations than we have now.