Bruh, global spaceflight contributes less than 0.01% of global CO2 emissions and enables climate resiliencey through weather and climate monitoring satellites, plus technological skunkworks (many of the challenges in the microclimate of a space station happen to be the exact same challenges of the macroclimate of the Earth, plus there's a proven path of technology developed for space directly improving lives on the ground here on earth)
If you can build an orbital launch vehicle that doesn't rely on fossil fuels, please do! Seriously that is a greatly needed technology and you'll have earned the wealth and fame that would bring you. But until then I'll take the next best thing which is having a space program and compensating for it's (absolutely tiny compared to basically all other industries) emissions in a larger global climate plan over not having a space industry