Indeed, it is doable, but it's not trivially doable:

"Forest restoration is an inclusive process, which depends on collaboration among a wide range of stakeholders including local communities, government officials, non-government organizations, scientists and funding agencies."

Sounds more like getting various permissions and money, be actually doing the work.

We are still a long way from understanding how to do restoration properly. Mostly we make forest gardens that don't look anything like real forests. We have tons to learn, and that's not even counting the bits already known by people who aren't doing the work.

A lot of problems are easy to solve with money and permission! Building trains is similarly straightforward if we can secure the money and land use permits.

In regards to the Amazon, the stakeholders also include organized crime

Its doable but not in 10 years. From [1]

> They found that soil fertility takes less than 10 years to recover to old-growth forest values. Plant functioning takes less than 25 years, and species diversity takes 60 years. Above-ground biomass and species composition take over 120 years.

This is also discounting any of the unique biodiversity in the Amazon, of which there is a lot and may never come back.

[1]: https://news.clemson.edu/researchers-if-left-alone-tropical-...

I wonder if things like species diversity and above-ground biomass and species composition can be achieved faster due to being an annex of a thriving forest. I imagine once plants and soil are established that species will move in from the bordering area fairly quickly.

A cheaper, lower diversity, forest. 1000 Yo trees can't grow in 10 years

I live in the marginal subtropics in an area with subtropical rainforest. There is a severly degraded historical landslip at the back of my house which we've been working on for 12 years or so.

After getting rid of the gross weeds, it only took a couple of years for a bunch of native rainforest species to start popping up, but it's going to be a very long time before what they call "ecosystem function" is approximately back to the way it was before. You can reduce this time in the tropics because the carbon cycle is so fast, but it's still going to take many years of restoration. Appropriate management can speed things up, but only so much - and the techniques used vary in effectiveness.