[PeterisP]

Well, we probably will not keep to less than 1.5C of warming, e.g. in the IPCC report even the most optimistic (i.e. unrealistic) scenario has a most likely estimate of 1.6C of warming.

IMHO when estimating future, starting with the desired outcome (or even considering it much) is harmful, as it causes you to accept unrealistic assumptions and estimates for the key items driving your predictions, just so the predictions will come out as "acceptable" to you. You need to consider the impact factors as they are, and have realistic expectations of the effect and likelihood of interventions (especially considering the specific motivation factors of the narrow groups who can make each of those interventions, how that aligns with their interests), and see to what prognosis they lead you.

If we "need to come up with ways" then it means that it's plausible that we won't, and we (in this case, not we-as-the-world but we-as-individuals and we-as-smaller-communities) also need to plan on how to protect our interests in that (quite likely) scenario. An aching desire for something to work does not imply that it's possible in the required timeframe. Especially because there's no single "we"; those that need a solution to climate change and those that could fund it are largely separate groups; you can't look at it as a primarily technical problem when the largest impact factors are political.