This is a lie. Plenty of suggestions have been made from this part of the political spectrum which are primarily based on incentivizing less damaging behaviour. The problem is that while we can reduce flying and we can reduce trips by car and we can reduce meat consumption and we can force shipping companies to use more environmentally friendly albeit more expensive fuels, none of the "technological solutions" you and other people say "should be developed" exist at the moment. By all means, feel free to invent new technologies which reduce carbon footprints and which help tackle climate change, but stop saying that really someone should develop these things so that maybe they could be used twenty years from now.
Twenty years ago, we had the option of either drastically raising taxes on CO2 or trusting that "technology" would arrive to reduce CO2 footprints. We were promised exclusively electric cars everywhere by 2020, passively cooled and heated housing etc. etc. None of those things have materialised, instead now we have people saying that we should "improve technology" and maybe in twenty years time we will have some solutions.
We really need to start acting now.