Final answer:
The amount of global warming from 1910 to 1940 and from 1980 to 2005 reflects an overall warming trend indicated by historical land and ocean temperature measurements. data.
Step-by-step explanation:
The question pertains to the amount of global warming that occurred from 1910 to 1940 and from 1980 to 2005. To answer this, we turn to historical climate data that shows variations in average annual global temperatures.
Direct evidence of global warming is found in measurements of land and ocean temperatures, which have indicated an overall warming trend over the past century.
Increases in atmospheric CO2 levels, primarily from the burning of fossil fuels since the Industrial Revolution, have contributed to this warming by trapping more heat in the Earth's atmosphere.
From the periods mentioned, it's known that there was an observable warming trend. However, specifying exact temperature increases for those periods would require access to more detailed climate data.
Since the mid-20th century, scientists have been using a baseline reference to measure deviations. It is noted that the average global temperature has been rising for the past 100 years, and environmental biology predicts an increase of 2°F to 11.5°F by 2100, depending on future greenhouse gas emissions and climate models.
So, we can say that the increases in CO2 levels due to burning fossil fuels have contributed to the warming. Detailed temperature changes for these exact periods would require more specific climate.