Current (80m high) "Windfarms" - far from slowing global warming - are yet furtrher aggravation. They are so hopelessly out of tune with physical reality, that - by the end of their 50? year life they have supplied in all, only a fraction of the energy required to replace them. There are 3 reasons for this, of which I shall point-out just 2 of now.
1) To get energy from the wind requires 2 major components. A Turbine, and an Alternator. These components just happen to exhibit opposite "Economy of Size" viz. In the T we pay for Volume in order to get Area. Souble the size is therefore double the cost/m^2
Meanwhile, one A to replace 4 of 1/4 the thro'put will be about half the cost of the 4. So the A-bill is halved by doubling the size of the "T-A device - TAD.
The lowest cost for T + A is around sizes where the T costs about the same as the A. For a very well-organized design, this happens at around One metre diameter. Just under this and the gearing required becomes 1:1 !!
Successive doublings - or halvings - of size from this size can be seen to change the cost - Per M^2 of weather faced - as:
2, 2.5, 4.25, 8.125, and so on, if the cost of the T and the A start at 1 Wad each.

2) There are two modes of operation of any T-A device. We can keep the speed the same and vary the angle of the wings to suit the wind, or we can keep the angle the same and arrange for the speed - rps - to vary to suit the wind. In this latter mode, the power taken from the wind will vary as the Cube of the speed, i.e. if the wind changes by a factor of 2, the power taken will change by a factor of 2x2x2, or 8.
In the constant rps mode (windfarms) the higher winds are progressively wasted which gives a pretty-much "prorata" power-taken v windspeed relationship. e.g. windspeed x2, popwer taken approx x2 what it was.

It is quite possible by taking into account these realities to make a wind-energy system which sustains itself and therefore supplies energy which ACTUALLY IS free. Current practice is - in Reality - nothing more than window dressing at the expense of further global warming. I get the impression that many are unaware of this, whilst others would rather not be reminded.