I wouldn't bet on plants - as beatiful, wonderful, versatile and multi purposeful as they are - being more efficient at removing CO2 from the atmosphere than technical solutions.
I've come across at least one scientific publication that stated that photosynthesis is rather inefficient at capturing the energy of sun light and converting it into chemical compound, compared to apparatuses.
Just to add another piece of context to this.
Plants might not be effective/efficient enough to pull enough CO2 in their current natural genetic setup ... but as this awesome talk suggests, plants could maybe be modified to be _the_ essential factor that will save us all:
https://www.ted.com/talks/joanne_chory_how_supercharged_plants_could_slow_climate_change
#climateChange #JoanneChory #plants #CO2