In Science, you observe the data and develop a hypothesis that fits the data.
Here, They are taking a hypothesis (Global Warming) and trying to develop data to fit that hypothesis.
Although the Global Warming Scientist are doing that Global Warming proponents are more devious than that.
They build a theory that regardless of what the data say it can not refute the theory.
If Earth warms it is global warming, if the Earth cools it is global warming.
Global Warming can not be refuted (in the minds of its proponents) because it is not a scientific theory at all but a pseudo religion. Those who keep the faith will not be dissuaded.
Can’t be said too often...falls under education of the masses...