1940-1970 was a cooling period. This is why they were talking about "the little ice age" and global cooling in the 1970's.
But by the late 1980's, they realized they were wrong. That's because things changed around 1970, and a warming period began, that lasted until about 2000. This is why they changed to global warming.
But that also did not last, as things changed again around 2000, so they switched to "climate change." The climate is always changing, so they can use that dishonest phrase for anything.
There is a 30-year sub-cycle of the climate.
1940-1970 was a cooling period. This is why they were talking about "the little ice age" and global cooling in the 1970's.
But by the late 1980's, they realized they were wrong. That's because things changed around 1970, and a warming period began, that lasted until about 2000. This is why they changed to global warming.
But that also did not last, as things changed again around 2000, so they switched to "climate change." The climate is always changing, so they can use that dishonest phrase for anything.