[Svartalfiar]

In cities, new housing estates and flats should be kept warm by networks of hot water, says the report. The water could be heated by waste heat from industry.

Heat waste from industry? So now they want you to live right next to the industrial part of town? Or do they somehow expect hot water to just travel around town and not cool down at all as it moves through pipes laid in freezing ground?

An alternative approach is to use heat pumps, which draw warmth from the sea or lakes; or burn gas from waste.

Seas and lakes are not that warm... and how does a 'heat pump' move the heat around? A water pump? with the same issues as above, only starting with not hot water? And burning waste? Isn't the whole point of their plan to not burn stuff into the atmosphere? How is burning waste (full of random metals and chemicals) better than burning hydrocarbons?

[from occupied ga]

how does a 'heat pump' move the heat around?

It works exactly the same as an air conditioner (an air conditioner is a heat pump)except the cold side is on the outside and the hot side on the inside.