Trees and all plants love CO2 they thrive from it. Many farmers pump CO2 into their greenhouse to help the plants.
Yes, and they absorb the CO2 over their lifetime, they don't a) absorb the CO2 where it was generated and b) absorb all the CO2 made during manufacturing when they are planted.
They absorb CO2 over years. Allegedly, the land that was leased to plant the trees on Apple's behalf can be used until 2029, after which it
could be deforested again, then sold to the next tech company to offset their CO2 emissions. That is silly. Those trees absorb and hold the CO2 until they are cut down, then all benefits are lost, they stop absorbing the CO2 and if the are burnt (in part of whole), for example, the CO2 they have absorbed is released again. These trees need to grow for a minimum of, probably, 50 years to be effective, but they are only guaranteed a life until 2029, after which anything could happen.
A Eucalyptus tree, being a fast growing tree, could absorb anywhere from 10Kg to 40Kg per year, the Apple Watch generates around 40Kg during its manufacturing process (Apple Report on their home page from 2019, I didn't find a newer one after a quick search). That means they need to plant at between 1 and 4 trees per Watch sold, if they want to recoup the CO2 in the first year. For each additional year the tree grows, it will absorb another "Watch" of CO2, but, again, is only effective as long as it is growing.
Planting trees is necessary, deforestation is causing big problems, so good that Apple is using these companies to reforest areas, but they are using a monoculture of non-native trees, both of which have proven to be bad. Germany found that out a couple of decades ago and is busily replanting its forests, because many of the local, indigenous trees were ripped out and replace by pine, which is not native, but fast growing. But they had ripped out dozens of different species of tree and replaced them with a mono-culture, because that was easier to earn money on. Disease and weather changes have meant that large swathes of those pine forests have died off and they are currently replanting them with oak, ash, birch etc. in a mix, because that is more resilient, even if the trees take longer to grow, until they can be felled, and they can't just wade through and fell everything in their path, because they have to cut down only selected trees.
The concentration should be in increasing the longevity of products, so that they don't need to make as many, and optimizing the manufacturing process to create less waste, especially in green house gases and the use of poisonous substances.
