Just when you thought there was nothing but despair emanating from UN climate negotiations in Madrid, that there was no creative way to push recalcitrant big emitters toward the end of the fossil fuel era, Climate Action Network-International is out with a crossword puzzle primer (yes! a crossword puzzle!) on the fossil phaseout.

The puzzle showed up in the December 10 edition of ECO, the daily COP newsletter produced by Climate Action Network-International, timed to coincide with an energy ministers’ meeting during the conference. “We need to get moving now to limit warming to 1.5°C—and that’s a matter of life and death for many people,” CAN-I wrote. So “ECO presents a little puzzle to get you warmed up for a robust dialogue on ending the fossil fuel era.”

From the Russian company that could be responsible for unlocking the most new oil and gas production to 2050, to the first multilateral bank to phase out fossil fuel finance, the crossword may actually be the elusive antidote to two weeks at a high-stakes, high-stress conference largely dominated by fossil fuel interests and laggardly governments. (Australia, Brazil, Trump administration, we’re looking at you!)

So take a minute and test your knowledge. (If you’re at a loss for background info, the Energy Mix advanced search has got you covered.)