[RightWhale]

There is a lot of coal on the planet. While we are already at Peak Oil or past, Peak Coal is 50 years off. There is also Peak Natural Gas which is still a few years off. In any case the cost of energy is increasing, even coal has doubled in the past couple of decades.

The cost of extraction of an energy resource can be calculated in units of energy required to extract the resource.

An example is carloads of coal extracted by using one carload of coal. 100 years ago one carload of coal would extract 100 carloads. Now one carload will extract 40 carloads. It shoud be evident that something is running down.

[cyborg]

There's more open space in Zimbabwe for solar panelling. I'm not a fan of wind turbines, but the sun is free :)