The great cycle of water is well known: the rain clouds that come from the sea
flow onto the continents and form the network of rivers that flow back into the sea…
The small water cycle, on the other hand, is ignored or misunderstood.
However, thanks to the evapotranspiration of soils and plants
the continents provide more than half of their own water resources.
The water vapour emitted by plants :
– cools the atmosphere by consuming solar energy,
– condenses and falls locally as gentle, regular rainfall,
– dampens temperature differences and avoids storm fronts…
But the modification of the planet’s surface by human activities has reached a critical point.
Deforestation and soil sealing, the grey concrete of cities and the green concrete of intensive farming
have broken the small water cycle and its natural cooling.
Artificial and degraded surfaces produce huge amounts of heat on a scale unknown in the history of mankind.
The greenhouse effect, aggravated by human activities, contributes to storing this unprecedented heat production.
Knowing the different origins of the industrial greenhouse effect also opens up astonishing perspectives.