You could use a pencil and turn off your electronics. You could also stop reading fake news. The countries that cause the most harm are not interested. The virtue signaling counties could turn off everything and still not make a difference.
There is a rather famous blogpost by Bret Victor on this topic
<a href="http://worrydream.com/ClimateChange/" rel="nofollow">http://worrydream.com/ClimateChange/</a>