It cannot be ignored that the Earth, throughout millennia, has undergone transformations without direct human intervention. However, the indiscriminate felling of forests has destabilized global ecosystems, contributing to the expansion of desert areas and ongoing climate change. Deforestation leads to an increase in arid areas with its consequences: extreme temperatures, loss of biodiversity, and disruption of hydrological cycles.
The role of trees in climate regulation
Trees not only absorb carbon dioxide (CO2), but also play a vital role in cloud formation by releasing tiny particles during photosynthesis. These particles act as seeds for clouds, reflecting sunlight and contributing to climate cooling. Clouds formed through these processes reflect more sunlight and help maintain the planet's thermal balance. Recent findings from the CERN CLOUD experiment confirmed that the pre-industrial atmosphere contained more particles and formed brighter clouds.
The experiment suggests that most water clouds require these tiny particles, and the more there are, the brighter the clouds will be. This highlights the importance of keeping natural ecosystems intact so they can continue to regulate Earth's temperatures.
Volatile gases and air purification
Trees release volatile gases called terpenes, which are key to the formation of aerosols in the atmosphere. This phenomenon is most evident in the blue haze observed over large forested areas. Terpenes contribute to air clarity and purity, demonstrating that forests are not only fundamental for biodiversity but also for atmospheric purification. The gases they release help create the particles necessary for cloud formation, which regulates global temperatures.
The impact of anthropogenic changes
Although half of the particles in the atmosphere come from natural sources , such as dust, volcanoes, or fires, a large portion comes from human activities like the burning of fossil fuels. This generates sulfur dioxide and soot, which not only pollute the air but also directly affect the atmosphere, causing phenomena like acid rain.
Deforestation for agriculture and construction has reduced the capacity of forests to release these particles. Through logging and the alteration of natural landscapes, we have lost an essential source of air purification and climate regulation. Furthermore, uncontrolled logging has exacerbated the trend toward desertification, one of the major environmental problems of our time.
Recent experiments and discoveries: CLOUD example
Thanks to studies like CERN's CLOUD experiment , we have a better understanding of how clouds formed before the Industrial Revolution. This experiment has expanded our understanding of how naturally occurring particles controlled the formation of bright clouds. The discovery that gases emitted by trees can balance global temperatures by forming denser, longer-lasting clouds leads us to reconsider the importance of forests for our future.
The findings reinforce the need to limit pollution from industrial and transportation sources, while simultaneously protecting and restoring the natural ecosystems that regulate the climate. Massive deforestation and its conversion to farmland not only destroy habitats but also contribute to global warming by releasing the carbon stored in trees and soils.
The importance of protecting forests for the future
Global forest cover is declining at an alarming rate. In 2020, an area the size of a football field of forest was lost every six seconds. Forests not only provide oxygen and absorb CO2, but they also retain groundwater crucial to the water cycle, protecting communities from floods and droughts.
Furthermore, trees mitigate the impact of climate disasters such as hurricanes and floods. Extensive research conducted by the World Bank highlighted how some countries, such as Ethiopia and Vietnam, have implemented reforestation programs to promote climate change mitigation and improve the resilience of local communities.
In rural areas, small-scale farmers rely on trees on their farms to improve the soil and protect their crops. Agroforestry, therefore, not only helps capture carbon but also improves food security, especially in regions vulnerable to climate change.
The importance of trees for climate regulation and the health of the planet is indisputable. Preserving forests and restoring deforested areas is a fundamental task that will not only guarantee the stability of the global climate, but also food security and the well-being of future generations.