The recent drought in India that has resulted in one of the major cities, Chennai, effectively running out of water just as Cape Town did last year, is a cause for concern. The proposed solutions appear to focus on water availability and they are likely misguided. The blue planet has plenty of water, but it is brine. So, it is not lack of water that humans should focus on but rather how to remove salt and other impurities from this abundantly available resource on Earth.
Just like many other contemporary problems, this could also be solved by cheap energy. With an efficient Hydrogen furnace in close proximity, an advanced civilization would have reached technology that can emit zero cost energy. Unfortunately, humans are still clinging on to the concept of unearthing and burning highly toxic Carbon for their tactical needs. For humanity to advance, it has to set a goal on close to zero cost energy production as that will solve many problems threatening their very existence, including rising temperatures.
However, policy-makers and politicians are not sufficiently schooled on how the complex habitat react in non-linear ways and why feel-good actions are ineffective. For example, reducing greenhouse gas emissions from the current levels will have no measurable effect on outcomes. That window has been closed a long time ago. So, all the noise around policies and accords world over is just that, noise. Of course, it makes many feel good that they are doing “something.”
The more important thing to focus on is technology – how to terraform Earth back to its original condition. There are plenty of ideas available but it will take resources and a focus on research and development. And, R&D should move into exotic and untried options, not conventional ones to simply suck the bad stuff out and sequester it underneath. On a planet suffering from plate tectonics and idiotic human actions, it is unlikely that the bad stuff will stay down for long.
Advanced R&D is sorely needed not only to mend a broken planet but also to assure its inhabitants have life-giving fresh water forever.