What do you mean how? You will not die from climate change that's how. There is no data that accurately predicts an end to the human race due to climate change. It's an issue that deserves attention, but the likelihood that'll it wipe you out or anyone in the near future is pure bullshit.

Things are improving, humans will adapt etc.

You were far more likely to die from a number of natural things before modern inventions (yes the ones that are now causing climate change) helped keep you well fed, warm, etc.

Isn't the person claiming something is going to happen the first one that needs to explain why and how? Only after that, it makes sense to ask the person denying the original claim to bring his arguments.

Or, to put it simply: in this case, it's the doomers that need to answer how and why.