But if CCS operations leak, they can pose significant risks to water resources. That’s because pressurized CO2 stored underground can escape or propel brine trapped in the saline reservoirs typically used for permanent storage. The leaks can lead to heavy metal contamination and potentially lower pH levels, all of which can make drinking water undrinkable.

Can someone explain this to me in a easy way?

As a layman I would be worried of large amounts of CO² suddenly leaking near where people live. But how does it make water undrinkable? I thought some people like their drinks with CO². And where do the heavy metals come from?

Sequestration only is possible if the concentration of CO2 is high enough, like on the exhaust of a coal fired power station. So where is the extra energy coming from to drive the process? Not from renewables as there is insufficient to meet the needs of decommissioning. More fossils have to be burnt paid for by the tax payer, Sequestration is pretty much a smokescreen to.avoid transition from fossil fuels.