Low-Hanging Fruit: easy steps, things we can do that will produce some results easily and quickly.
For example, spreading an inch or two of biochar on all the arable land on Earth in order to reverse and reduce global warming is not low-hanging fruit. We might have to do it to save ourselves one day, but it is not easy and quick!
But producing efficient, smokeless stoves to remove soot from the air is.
Painting roofs white to reflect solar energy back up to the atmosphere, is.
Using CF and LED light bulbs to reduce energy consumption, is.
Make your own list. And then start picking your fruit!