Meanwhile, that's about half of the low end of what plants prefer - 800-1200ppm.
Their alarmism about (the 180ppm) of the last Ice Age, meanwhile, was almost low enough to kill all plantlife on the planet (and with it, most animal species that depend on said plants). We were dangerously close to global annihilation.
For context, 1000ppm is going to be a stuffy office space, and 800ppm a well ventilated indoor space.
A well-fitted surgical mask like so many medical professionals insisted was necessary some short years ago? Those have been measured to result in a CO2 of 2,000-5,000 (with peaks up to 8,000ppm when its actually fit properly) for the air being inhaled. (But don't worry, that's still under the 8,000ppm 8-hour OSHA maximum.)
If plants like CO2, they're going to grow more rapidly and prolifically. That means, in turn, they'll be producing a lot more oxygen. Let's assume a moderate increase in O2 to 25% ambient... which is more than safe, and even preferable. The result would be that humans could withstand significantly higher CO2 ppm.
I'm not sure why we've ever started talking about CO2 as a "greenhouse gas" when it's 0.0425% of our atmosphere, and the facts above (about it causing significant greening of the planet). That much is well established, and it's well accepted that greening an area will decrease, not increase, the temperature of the area. We've seen this play out significantly in the last decade or so in eg. North Africa. This more than offsets the "global warming".
More CO2 is not only not bad - its beneficial and preferable.
The big problem with the CO2 hysteria (such as in the OP) is that it's myopic and agenda driven. "You've got to consume less" - which is true, regardless, but bellies the point that such propaganda is directed at Western countries which produce both less CO2 per capita and in total vs countries like India and China, which have effectively zero efforts in place to reduce its production. It's clearly aimed at the Western countries to hamper them economically. Outside factors, like solar output, are never considered in these breathless press releases about global warming. Notice how "global warming" is conveniently replaced with "climate change" in the media during periods of low solar output? We're now nearing the peak of the ~11 year solar cycle with the solar maximum likely to occur this year. Expect seeing more "global climate change" in the news in the coming years...