Here's an idea. Australia has a lot of barren land, otherwise known as desert. Cover the desert in trees or plants and you've got a big carbon sink. So, cover the place in plants.
But wait, I hear you say, the roots would need water. They would and this idea would require some serious engineering. To begin with; plants that take large amounts of carbon dioxide out of the air and deposit it deep in the soil. But at the same time, plants that require minuscule amounts of water.
Then where does the water come from? New Zealand's west coast of the South Island. The coast is the wettest place on planet earth. Then ship that water to Australia and feed it into a trickle irrigation system to keep the plants alive.
See where I'm going with this? Australia has the land, NZ the water. Australia pays NZ for the water, and the earth pays Australia for the carbon sequestration.
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