EFCT: Environmental Footprint Comparison Tool.  A tool for understanding environmental decisions related to the forest products industry.  Water. headerlink
Effects of decreased water use on greenhouse gas emissions

Because water use can affect energy requirements, there can be a link between water reuse and greenhouse gas emissions. Greenhouse gas emissions are, however, also affected by a large number of other much more important factors so that the co-benefits from water use reduction are relatively small.

To understand the effects of water use on energy consumption, which can affect greenhouse gas emissions, see the section Effects of Water Use on Energy Use.

For the inverse question i.e., what would happen to water use if a company tries to decrease greenhouse gases the answer is different. The inverse question is examined in the section Effects of Decreased Greenhouse Gas Emissions on Water Use.

More information:

GHG Emissions for different fuel types