Where abouts are you I'm Denver? If I know what zone I can make a recommendation.

But for example, if purely sequestering carbon is your goal, you would plant hemp and cut it very regularly. It may not make many friends. Or you could plant Paulonia Tomentosa, a nasty invasive, but world's fastest growing tree.

But if you want a more holistic approach, I could give a sample polyculture guild you could use if I knew what zone you were on. For example, NW Denver is almost zone 7, whereas South East Denver is as low as zone 4b or 5a.

I can help with this. I help design ecosystems that minic nature (Canadian Permaculture Legacy on youtube).

Stop thinking about what is the best tree. Planting trees isn't the solution. Trees are fragile. We shouldn't be sequestering carbon using "pines in lines".

We should be planting ecosystems. Trees, bushes, herbs, flowers, groundcovers. Our goal should be to design in as much diversity as possible to attract the most amount of insects, which is food for higher order creatures, and using plants that build soil life. We should use natives (to attract the insects that eat them).

This way, we aren't just planting trees, we are building soils and restoring the food chain.

Pines have very little food for other creatures. Seeviceberries on the other hand may sequester carbon slightly slower, but they attract birds. Lindens support bees. Milkweed brings in monarchs. Yarrow brings in green lace wings. Innoculated logs bring in mycelium, and habitat for insects, which are then food for frogs which are food for snakes, which are food for small mammals. Etc.

Building a robust ecosystems will leverage any benefit from the tree, by building soil, and a resilient web of life that will replicate itself along the edge of the new forest.

We can either plant 1000 trees that will die in 20 years and create a dead ecosystem, or we can plant 1000 trees, flowers, bushes and herbs that will replicate themselves and create a system where birds and squirrels now plant new trees, bees spread pollen, dynamic accumulators build topsoil, etc.

This is pretty telling isn't it? Conservstives are more likely to listen to science from a religious leader or businessman than from a scientist.

This is the core problem.

Businessmen put profits over the environment. And Catholic religion (am a catholic) states that the earth is Man's tool to use and exploit.

So it's a major problem when the only people conservatives will listen to actually have a bias to deny climate science (AND aren't themselves scientists).