Mitigation vs. adaptation

Waste heat: heat with it, don't generate power

Unused waste heat is mostly low-temperature (often 30–40 °C, raised to ~70–80 °C by a heat pump). Generating electricity needs a large temperature gradient, at low temperatures that makes little thermodynamic sense (exergy). Its place is heating: district heat, neighbouring plants, buildings. The BfEE Waste Heat Platform lists around 207 TWh of commercial waste heat nationwide, from over 23,000 reported potentials at more than 3,000 companies.

Proximity caveat: A potential is not yet a supply. Waste heat is only usable if consumers are nearby or a heat network exists. A nationwide total says nothing about what is usable locally. A facility-level map would be possible but awaits a clarified reuse licence for the source data.

Green is not a carbon sink

Green roofs, de-sealing and sponge-city measures are valuable, their benefit is cooling, stormwater retention, biodiversity and quality of life. It is not meaningful emission reduction. Presenting greening as climate protection confuses adaptation with mitigation, exactly the line this page is about.

That greening delivers no emission reduction does not make the biodiversity benefit a side note. It is simply a benefit in a different dimension, and the two are never added together. Where climate action helps species diversity and where it harms it has a page of its own.

Bridge to the projections

The very consequences the projections show (more hot days, more frequent heavy rain, longer droughts) are what adaptation addresses. The separation still holds: adaptation does not reduce warming, it softens its consequences. Conversely, mitigation does not cool the world immediately. It limits how heavily the dice keep getting loaded.

Against what, exactly?

Adaptation stays an empty phrase unless it says what it is meant to fend off. Two hazards on these pages are backed by data, and both show the same pattern: it is not raining less, it is evaporating more. Forest conversion and water retention act on both at once.

Three caveats

Rebound: efficiency gains are often partly eaten up by higher consumption, the saving is rarely the full technical one. Embodied energy: renovation and reuse often beat a new build despite worse operating efficiency, because construction itself locks in a lot of energy. Maladaptation: some measures taken against a consequence of climate change reinforce the very cause they are aimed at. Deepening a fairway so that ships can sail despite low water accelerates the incision of the river bed, lowers the groundwater of the floodplain and reduces the water retention that would dampen low water in the first place. Adaptation is therefore not automatically good; it has to be checked.