Composition of Earth's atmosphere by volume. The lower pie represents the trace gases that together compose about 0.038% of the atmosphere (0.043% with CO2 at 2014 concentration). The numbers are from a variety of years (mainly 1987, with CO2 and methane from 2009) and do not represent any single source.
User: How long did Thoreau live in the woods at Walden Pond? User: How long did Thoreau live in the woods at Walden Pond? Weegy: Thoreau lived in the woods at Walden Pond for two years, two months, and two days.
Thoreau stayed for two years at Walden Pond (1845â47). In the summer of 1847 Emerson invited him to stay with his wife and children again, while Emerson himself went to Europe. Thoreau accepted, and in September 1847 he left his cabin forever.