This problem is so big that a multi faceted approach is needed. Nothing will happen if we don't get the politicians on board and they will cling on until the bitter end. We can all make small incremental changes (as you say) but those boys at the top will need to be forced if they are going to take action and until they do, much of what we do will be irrelevant. Greta may not provide all the answers but she is good a pointing at the problem, and that in itself is hugely important.