echo, eco-

Echo or echo means the sound you may hear if you yell into a canyon or ravine--a faint "repeat" of what you yelled, almost like one of those toys that repeats what you say--
 "...my echo, my shadow, and me..."
If you stand on the edge of the canyon and yell, you may hear an echo.

Eco- or eco- is a prefix ( a word "part" that is added to the beginning of a word ). Eco- is often added to existing words to mean "green", or non-polluting and earth-friendly--
He set up a website to promote a new line of eco-products.
The FBI uncovered an eco-terrorism plot.

Now that you know that, you can say--
"The author of the weekly environmental report repeated all of the news in eco-terms, like a green echo."

Note--"echolocation" is how bats and some sea creatures find their way when they can't see. They make noises, and listen for the "echo". They can tell where things are because they can hear where the "echo" comes from--
Bats find their way by echolocation.

Note # 2--"Ecko" is the name of a manufacturer of kitchen gadgets, always capitalized--
He bought an Ecko kitchen strainer.