Plants as the climate savior? Yes, because even facade greening helps our climate. It binds CO2 and particulate matter, increases the humidity, and contributes to lowering the temperature during hot summers. Less hot air means less air movement, less whirled up dust and dirt... in short, more quality of life! Climbing plants, particularly those with full-face greening are so important, especially for the micro-climate.
Climbing Plants absorb CO2 and form carbohydrates, i.e. sugar or leaf fibers and wood pulp. This aspect is interesting, but ultimately there are only small amounts that are seen with the autumn leaves, the thick growth of trees, and possibly the fruit. Only the dry mass is measured in kilograms and are per house, per year wall then about 2-3 car tank fillings worth of CO2 that have been 'captured' by the plants from the air again, unfortunately not more ...
A chemical accompanying effect of the fission of CO2 and the bond of carbon (C) is the release of oxygen (O2) which spreads out into the ambient air on the leaf undersides.
When the sunlight hits the dark green leaves, it converts partly into heat, as a collector does for a water heater. However, the chemical processes of binding the CO2 need consistently low temperatures, so the heat has to be removed. This is done by evaporation of water on the leaf surfaces into the ambient air. Then the evaporated water increases the humidity, and the water sucked up by the roots in turn contributes to building moisture removal and drying.
Green facades will "eat" unwanted heat in the summer and provide you with air and wall cooling benefits. How is this possible? On the one hand, it is the above evaporation, the (heat-) energy consumed, on the other hand, the chemical processes around the carbon.The heat created during combustion of carbon to carbon dioxide is needed more or less again when captured and consumed, if the carbon is again involved in photosynthesis... So the surrounding air cools and falls down, similar to a forest with the palpable coolness one feels. But what is even more important is that the emergence of strongly heated air is curbed and air velocities in the floor area will be reduced. There will be less dust whirled up and restricted smog. This topic is now even the content of scientific study.
Leaves in the garden facade also absorb dust, especially most toxic dust. Once "captured", these extremely small nano-particles are hardly dangerous and are then washed away with the next rain or composted during autumnal leaf fall.