Climate scientists have used a range of methods to confirm that human activities are responsible for the observed global warming trend. One way is by measuring the concentrations of heat-trapping gases in the atmosphere, such as carbon dioxide, which have been increasing significantly since the Industrial Revolution as a result of burning fossil fuels like coal, oil, and gas Another method involves analyzing ice cores and other paleoclimate data, which have shown that the current warming trend is occurring at a rate that is 10 times faster than the average rate of ice-age-recovery warming, and that the most recent decades are the warmest in the past 1,500 years.

Scientists have also used computer models to simulate the Earth's climate and to study how it responds to different levels of greenhouse gas emissions. These models have been refined over several decades and have consistently shown that the observed warming trend can only be explained by the increase in greenhouse gas concentrations due to human activities.

To distinguish between human-caused and natural climate change, scientists have also studied the factors that have caused climate to change in the past, such as changes in solar radiation, volcanic activity, and variations in Earth's orbit. However, these factors cannot explain the current warming trend, which is occurring at a much faster rate than any natural variation seen in the past. Furthermore, the warming trend is primarily driven by the increase in greenhouse gas concentrations, which are caused by human activities.

In summary, scientists have used a variety of methods, including measurements of greenhouse gas concentrations, paleoclimate data analysis, computer modeling, and the study of natural climate factors, to confirm that human activities are the primary cause of the observed global warming trend. The overwhelming consensus among climate scientists is that the evidence for human-caused climate change is strong and that natural factors cannot explain the magnitude and rapidity of the current warming trend.
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