What, the volcano in Tonga? That was one volcano. And it wasn't that big on the grand scheme of things. Krakatoa was much bigger and happened in 1883. It didn't have any significant effect on the climate. One volcano eruption here and there isn't going to compare to the level of carbon emissions and other greenhouse gasses produced by humans 24/7/365 starting with the beginning of the industrial revolution in 1760, population growing only at a positive rate continuously (we are now at 8 billion people). That adds up to 264 years of producing unnatural emissions constantly, all over the world where nations are developed, burning petroleum, raising mass herds of livestock, driving combustion engines not just in cars, but trains, boats, airplanes, farm equipment, construction equipment, generators, the list goes on. Plus, carbon emissions come from burning natural gas, firewood, charcoal, candles, incense, cigarette smoking, vaping, smoking weed,setting off fireworks and shooting guns. Electric heaters and blow dryers produce carbon monoxide. Nearly every house has at least one of each. Some may have steam radiators instead, but I bet you could find one or two space heaters in those homes, too. Let's not forget ALL the landfills in every major and third world country because we all produce garbage and the massive landfills produce tons of methane gas. And I'm sure I'm missing bunches of other sources, because I'm just trying to make a list off the top of my head I don't want to spend too much time on this. I'm just hoping that I could make some impression of how much humans are producing carbon emissions and other green house gases that wouldn't naturally be occurring otherwise.