You might note that zippi, wage slave, and James all say the same thing, more or less.
There are no thumbs down on zippi or wage slave, both of whom are persistent global warming deniers.
There are 4 thumbs down on James' answer. Almost certainly done by AGW deniers, simply because James says that global warming is real, and a problem.
These days, ocean temps can be taken by satellite, all over the earth. We know, with much more precision, what ocean temperatures are, even when there are no surface readings. However launching those satellites cost money.
We are aware that clouds reflect some solar radiation, tending to cool the earth, but also retard heat loss at night, tending to keep the earth warmer. And, of course, there's CO2, keeping the earth warmer. Methane releases also keep the earth warmer. To plan for warming in the future, it would help to know how much warming needs to be planned for.
Planting trees is good, but not all that much related to global warming. Trees are logged for wood and paper, and often, those areas are replanted. Trees are cut down in order to grow food, so replanting there defeats the reason that the trees were cut down. There's not much area where trees are removed, for no reason at all, and the wood is not used, nor is the land used. As I said, planting trees is good, but not an effective counter to global warming.
We are spending money on research because there are still things that are not clear. However, if more was known, that would help justify money spent to reduce warming.