Combat sea levels by excavating canals and/or constructing above ground pipelines to fill man-made lake beds with sea water which could be converted to potable water by condensation.
Using Sustainable Potable Water to maximize the benefits of Great Green Walls from Africa to China would lead to earlier afforestation and sustainable agriculture and habitat.
How about transporting water from the mouth of the Amazon River (above the salinity line) across the Atlantic Ocean to a machine-excavated riverbed that would eventually traverse the African Sahel from Mauritania to the Red Sea.
Imagine an infrastructure project where the by-products are positives: environmental responsibility, jobs, and international cooperation to tackle global challenges.
Create interconnected man-made lakes by transporting river water, combating desertification through local application of global water sources.