Comment by zahlman

Indeed.

> However, since the advent of widespread industrialisation, atmospheric CO2 levels have exponentially increased (Fig. 1). In just the last ~ 50 years it has risen from < 340 ppm (in 1980), to > 420 ppm in 2025 (Lan et al., 2025). Atmospheric CO2 is currently increasing at more than 2 ppm each year, largely due to humanity’s activities, such as the burning of fossil fuels (Eggleton, 2012).

There's good reason to believe we're on the cusp of a solar energy revolution and, more generally, ready to turn things around. But even in the worst scenarios I can imagine, outdoor air 50 years from now (as posited in the title) would not be as bad as indoor air now.