I swear I saw Monarchs far more often 20 years ago than I do now. The biosphere is fucked.
Yeah, friend's of my parents used to live close to the corridor they went through and would go take pictures almost every year. They stopped doing it because they had to travel farther and farther, and it was just all around harder to find the big migratory groups. They did this from the mid 70's til the early 2010s.
Climate
Discussion of climate, how it is changing, activism around that, the politics, and the energy systems change we need in order to stabilize things.
As a starting point, the burning of fossil fuels, and to a lesser extent deforestation and release of methane are responsible for the warming in recent decades:

How much each change to the atmosphere has warmed the world:

Recommended actions to cut greenhouse gas emissions in the near future:

Anti-science, inactivism, and unsupported conspiracy theories are not ok here.