I am saying it's too late. We probably haven't yet reached the point of no return but it is so perilously close that we won't be able to turn things around in time to avert the danger.
Individual actions have always been a piss in the ocean. For as long as our economy, and the global economy, are based on perpetual growth, we are fucked. If you want people to stop flying then target the airline industry to stop producing aircraft and scheduling flights. If you want to stop people from driving SUVs then target the car manufacturers to stop producing them. If you want to stop people buying roses from Kenya then target the government to ban their import. Even then, this is tinkering around the edges. The changes we actually need to make are so drastic, on such a short time scale, that no country is going there voluntarily.
Even if we somehow managed to avert the worst of climate change by pulling together as a planet and finding different ways of fueling the destruction, we still need things like soil, biodiversity, healthy rivers, oceans, forests, grasslands, wetlands ... climate change is not the only environmental crisis we are facing. For as long as the destruction continues we're still fucked. And it will continue because it has been a continuous process since the neolithic. We have not lived sustainably since we invented agriculture, adopted a settled lifestyle and began to accumulate wealth.
Maybe all is not lost and one day humans will live sustainably on this planet again but there will be far, far fewer of us and I can see no way of getting there that is not thoroughly dystopian.