Considerable academic studies and literature on this subject exists. Recent capture rate from current global forestation is estimated to be approximately 2.5 GtC/year. Current global carbon stock of forests is estimated to about 861 GtC [1] ( virtually twice that hastily sourced figure for total plant life even without those assumptions about algae etc )

Sequestration of current forests, despite the fact they are currently being depleted rather than maintained or increased is estimated by studies to be equal to about 5% of current overall anthropogenic emissions. [2]

For in-depth advice see Chapter 11 of IPCC AR5 [3]

" Reducing emissions from deforestation; reducing emissions from forest degradation; conservation of forest carbon stocks; sustainable management of forests; and enhancement of forest carbon stocks (REDD) consists of forest-related activities implemented voluntarily by developing countries that may, in isolation or jointly lead to significant climate change mitigation. REDD was introduced in the agenda of the UNFCCC in 2005, and has since evolved to an improved understanding of the potential positive and negative impacts, methodological issues, safeguards, and financial aspects associated with REDD implementation. "

[1] https://www.globalcarbonproject.org/global/pdf/pep/Pan.etal....

[2] https://forestsnews.cifor.org/12135/clocking-the-worlds-fore...

[3] https://www.ipcc.ch/site/assets/uploads/2018/02/ipcc_wg3_ar5...