Is global warming caused by CO2 released by humans

The short version: the evidence you asked about is almost entirely off-topic, and the few relevant records confirm that human CO₂ emissions are the dominant driver of modern warming, but the retrieval is too thin to give a precise number.

The question is whether human-emitted CO₂ causes global warming. The retrieved studies are a scattered sample. Most are about local carbon dynamics in lakes, rivers, soils, and batteries — they do not test the causal link between fossil-fuel CO₂ and global temperature. A handful of records do address the core question, and they all point in the same direction.

Record [3] (1977) documents that atmospheric CO₂ rose from 311 ppm in 1957 to 327 ppm in 1975, a 5% increase, and estimates that the airborne fraction of human emissions is about 40–50%. Record [1] (2004) calculates that the ocean absorbed about 48% of all fossil-fuel CO₂ from 1800 to 1994, leaving the rest in the atmosphere. Record [2] (2011) models the accelerating growth of Chinese industrial CO₂ emissions from 1998 to 2007. These three records together show that human activity has added a large pulse of CO₂ to the air, that about half of it stays there, and that the concentration has risen steadily.

The mechanism by which CO₂ traps heat is basic physics, confirmed across decades of independent measurement. The retrieved records do not re-litigate that physics, and they do not need to. The question is not whether CO₂ is a greenhouse gas — that is settled — but whether the rise is human-caused. The evidence here shows that the rise matches the pattern of fossil-fuel burning, that the ocean sink cannot keep up, and that the airborne fraction is consistent with human emissions being the source.

What the retrieval does not contain: a single study that compares the observed warming to natural-only drivers (solar, volcanoes, orbital cycles) and shows that natural forcing cannot explain it. That comparison exists in the broader literature (outside this retrieval) and is the standard test. The records here are consistent with the human-causal conclusion but do not independently prove it against natural alternatives.

My call: the evidence in this retrieval supports the conclusion that human CO₂ emissions are the primary cause of modern global warming, but the retrieval is too narrow to stand alone — it confirms the direction, not the full case. Confidence: moderate.