I think also a consideration could be the impact of increasing the mass of algae. More trees in an area seem unlikely to have a negative impact on things; certainly they compete with each other for nutrients/sunlight/water but they don’t hurt the animals around them. We’ve seen how blooms of algae can produce a situation where there are not enough animal algae consumers to manage the load, the algae and bacterial populations climb, O2 is depleted as a consequence of the bacterial degradation of the algae and now you’ve got a dead zone where no life succeeds. We do this “accidentally” all the time.
I think it’s a bit simpler than others are explaining. I think it’s because most people don’t know that fact. I certainly didn’t before you asked this question! And it’s very difficult to effectively propagate public awareness of facts like that without a massive cultural push from many sources, the likes of which deforestation has had over the last few decades.
Trees get hype and we know oxygen is hugely important, but the significance of oxygen production by trees is overestimated and the significance of trees for everything else is underestimated, by laymen, mostly.
Trees produce oxygen and absorb carbon. These are great things. But they also: provide habitats for other animals and organisms; stabilize the soil by digging a web of roots that act as a skeletal support for raw earth; retain moisture from the environment, helping the ecosystem maintain a balance of moisture between the rains; shed their leaves annually, helping enrich the soil around them; protect against wind; provide shade; and while we don’t understand all of the scientific reasons why yet, trees are scientifically proven to improve the happiness and health of people the observe and live around them (https://www.washingtonpost.com/news/energy-environment/wp/2015/07/09/scientists-have-discovered-that-living-near-trees-is-good-for-your-health/?noredirect=on).
Trees really are amazing for life on land. The ocean is teeming with life, but land is harder for life, because soil dries up and it takes a lot more energy to maintain our own temperatures, moisture levels, and to even move around on land as opposed to drifting in the water.
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