Scientists in the US and Mexico have mapped the DNA of several varieties, work that could help the fruit survive the effects of climate change.

In the early 1990s, a young Australian chef named Bill Granger had a bright idea: Why not spread avocado on toast?

Nearly three decades after that successful experiment, the long and sometimes bizarre history of the avocado has reached a new and potentially controversial turning point — albeit without the Instagram potential of avocado toast. As climate change threatens the fruit's place on brunch menus, some scientists are now asking: Why not edit its DNA?

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