Final answer:
The correct assertion supported by both the article and transcript is that human activity since the mid-20th century has caused global warming, a consensus supported by climate scientists.
Step-by-step explanation:
The assertion that is supported by both the article and the transcript is that human activity since the mid-20th century has caused global warming.
There is a strong scientific consensus indicated by direct and indirect evidence, including the trend of the average global temperature increase and the retreat of glaciers, which supports this viewpoint.
According to climate scientists, the warming trend cannot be explained by natural causes alone, and the increase in greenhouse gases from human activities, notably the combustion of fossil fuels, is most likely the significant factor behind the recent changes in climate.