"After the Gold Rush" is a song written, composed, and performed by Neil Young and is the title song from the 1970 album of the same name. In addition to After the Gold Rush, it also appears on Decade, Greatest Hits, and Live Rust.
The song considers environmental concerns using the form of a dream vision. The three verses move forward in time from the past, to the present, and, finally, the future. The line "Look at Mother Nature on the run / In the 1970s" has been amended by Young in concert over the decades and is currently sung as "Look at Mother Nature on the run / in the 21st century."
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A video for this song: