Since they're both about the environment and both really close to each other, could they be combined into one holiday:
Environmental groups have very little clout compared to the Corporate mega-rich and mega- powerful. Greenwashing is effective, so environmental groups are relegated to shout to the treetops. I personally think our best voice is our pocketbook- buy solar panels, and buy enough to power an EV. Better yet, ride a bicycle, or take mass transit. Build a net-zero home.