The two problems are closely related, and responses need to be carefully evaluated in terms of both (oh, and with land use, too)
Here's a quick list of some possible solutions, with their impacts (+ positive, - negative, = neutral) on the three problems.
|Peak Oil||Climate Change||Land Use|
|2nd Gen biofuels||+||+||-|
|Reduce meat consumption||+||+||+|
|Coal to liquids||+||-||=|