On what planet is a 50% increase small? The CO2 we've added to the atmosphere is trapping an almost unfathomable amount of energy in the climate system that wouldn't be there otherwise.
Theres more CO2 in the atmosphere that here has been in millions of years. Global average temps are higher than they've been in more than 100,000 years. The oceans are 25% more acidic. This is an out of control science experiment with the thermal and chemical properties of our at atmosphere and oceans.
CO2 is the primary greenhouse gas in terms of climate. You're on that water vapor crackpipe, but water vapor has a residence time of only 72 hours. It doesn't drive warming and cooling. It only works as a feedback for other things like CO2 that do. You should really just let this outdated climate denial bullshit go. It's embarrassing.
It would help if you defined your terms and context here.
Water vapor, carbon dioxide, methane, and other trace gases in Earth's atmosphere absorb the longer wavelengths of outgoing infrared radiation from Earth's surface.
Methane absorbs more infrared (per fixed amount) than C02, sure, but overall there's less methane (currently) and so the current volume of C02 in toto absorbs more infrared than the current methane volume.
Also relavent to the discussions is the relative rates of change .. the C02 concentration in the atmosphere has been less than 1900 levels for millions of years and has only recently in the past century climbed upwards in concentration by significant amounts .. leading to increases in water vapor and mthane levels.
CO2 is the reason the planet is hotter than it's been in 100,000 years and climbing rapidly. It's the reason the oceans are 25% more acidic. It's the reason sea level rise is accelerating. It's the reason there's 7% more water vapor in the atmosphere. It's the reason there's 2% less oxygen in the oceans.
Theres more CO2 in the atmosphere that here has been in millions of years. Global average temps are higher than they've been in more than 100,000 years. The oceans are 25% more acidic. This is an out of control science experiment with the thermal and chemical properties of our at atmosphere and oceans.