One is that 1998 was an unusually warm year, so by starting there you’re bound to see temperatures slowing their rise a bit. That’s called cherry-picking and is a favorite technique among those who deny global warming is occurring. It’s a no-no.
Another is that what’s being used are ground and sea-surface temperatures, which aren’t a very good way to measure global warming. The lion’s share of the extra heat from warming is being stored in deeper ocean water. We can measure that, and it’s seen.
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