because the goal of most conservation is to appear to be doing something without hurting the bottom line of big businesses that fund them. for other examples see air pollution regulations – cars these days are very efficient and a tiny drop in the bucket of total air pollution but thet get the most attention because trying to improve industrial air pollution hurts business
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.
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.
AFAIR it’s a bit hard to boost phytoplankton production. You need to seed it with iron / minerals from the land. Usually this gets taken care of by the winds. But if you want to manually seed it, the process will produce more CO2 than you will sequester this way. Trees are a lot easier to work with.
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