There are definitely worse scenarios. The worst I know states that most parts of the world will be uninhabitable by humans and estimate that there will be 1-1.5 billion survivors by the end of the century. So, end of our species? No, just too damn close for comfort.

Some more context: I couldn't find the report unfortunately and I don't know wether it's a majority opinion in science. The scenario talks about a temperature increase of 7°C and of course it's a worst-case scenario. However, it's definitely a possible scenario.

Edit: found this, definitely a credible scientist.