Trees sequester carbon by way of absorbing carbon for metabolic processes while giving off oxygen. Secondly, trees through their roots help to conserve carbon in the soil insitu

In terms of other efforts read the story of Wangari Maathai, who, among other accomplishments, founded the Greenbelt Movement in Kenya, which took many years to succeed. Dr. Maathai later won the Nobel Peace Prize.

It depends on the growth rate and biomass of the species

Globe means the association of all the environmental compartments like hydrosphere, atmosphere, lithosphere and biosphere altogether and Global warming has been there because of Industrial revolution, unplanned urbanisation, profit oriented capitalism, deforestation and population explosion. Plantation is no doubt one of the positive efforts, but without considering the reduction of harmful effect of all these above activities, mitigation of global warming may not be easily possible. Besides, the role of others spheres in carbon mitigation must also be taken in to account simultaneously, as large amount of carbon sequestration are occurring in others spheres. All the same, the positive efforts like plantation must be always welcome.

I fully agree with the argumentation of Michael and Phani. Besides, I would add that the impacts of planting trees in mitigating problems of climate change /global warming are agrarian, social, energy, and environmental: Agrarian impacts are related to land use for energy crops and the so-named food vs fuel debate. Social impacts are related to agricultural plantations oriented to biomass sources for biofuels production and the energy autonomy of off-grid remote rural areas. Energy impacts are related to the supplementary use of biomass sources to national energy mixes. Moreover, environmental impacts are related to flood protection, monitoring of land degradation/desertification, as well as carbon sequestration or other ozone depleting compounds through trees plantation and growth. The quantification of environmental impacts upon forestry management is attributed to carbon dioxide emissions, being modelled by software programs. Such program input data are based on global meteorological data and the selection among a wide spectrum of biomass sources, while considering their humidity and HHV. Indicative papers suggested are the following:

• Kyriakopoulos G. (2010). European and international policy interventions of implementing the use of woodfuels in bioenergy sector. A trend analysis and a specific woodfuels’ energy application. International Journal of Knowledge and Learning 6(1), 43-54. doi: 10.1504/IJKL.2010.034482.
• Chalikias M., Kyriakopoulos G., Kolovos K. (2010). Environmental sustainability and financial feasibility evaluation of woodfuel biomass used for a potential replacement of conventional space heating sources. Part I: A Greek Case Study. Operational Research: An International Journal 10(1), 43 – 56. doi: 10.1007/s12351-009-0033-y.
• Kyriakopoulos G., Kolovos K., Chalikias M. (2010). Environmental sustainability and financial feasibility evaluation of woodfuel biomass used for a potential replacement of conventional space heating sources. Part II: A Combined Greek and the nearby Balkan Countries Case Study. Operational Research: An International Journal 10(1), 57 – 69. doi: 10.1007/s12351-009-0034-x.
• Kyriakopoulos G. (2009). Biomass utilization for energy infrastructure and applications. International Journal of Social and Humanistic Computing 1(2), 163 – 174. doi: 10.1504/IJSHC.2009.031005.
• Kolovos K., Kyriakopoulos G., Chalikias M. (2011). Co-evaluation of basic woodfuel types used as alternative heating sources to existing energy network. Journal of Environmental Protection and Ecology-JEPE 12(2), 733 – 742.

Trees sequester carbon by way of absorbing carbon for metabolic processes while giving off oxygen. Secondly, trees through their roots help to conserve carbon in the soil insitu

I am certain that the IPCC has published some relevant figures and facts (and perhaps quoted some relevant references) on this matter:

Forestry - IPCC:

https://www.ipcc.ch/site/assets/uploads/2018/02/ar4-wg3-chapter9-1.pdf

Q: if planting trees and shrubs really helps reduce the effects of global warming; A: Yes, through multiple effects, including absorption of solar irradiation, the resulting effect of shade, evapotranspiration, (both have a significant impact on reducing the urban heat island effect). Blue green infrastructure in cities is not uncommon, check out: https://www.climate-kic.org/projects/blue-green-dream/

Q: if so how much would the impact be in some figurative terms;

A: This depends on multiple factors. Soil, climate (rainfall, avg temp, etc.), slope, species of trees and shrubs etc. Tree species have been assessed for their carbon sequestration capacity, and there is also a number called net primary productivity, which is used in ecology to assess grams of C production per unit area.

One of the impact is removal of CO2 from the atmosphere though will be tree species dependant!

The 2018 report by FAO could be helpful as well.

FAO. 2018. The State of the World’s Forests 2018 - Forest pathways to sustainable development. Rome. License: CC BY-NC-SA 3.0 IGO.

Thank you all, for your helpful additions. Thank you @Grigorios Kyriakopoulos for your detailed discussion and great work in the area!

As trees grow, their biomass increases from mainly structural carbon in form of cellulose, hemicellulose and lignin. This carbon in the structure of the tree is taken through photosysnthesis. If you know the wt of the biomass of one tree, nearly half of its wt is carbon and you can caluculate the amount of CO2 removed by that tree. If 75% of the seedling survive and grow to the age of 25, then it is possible to tell what quantity of CO2 is removed from the atmosphere and stored in the biomass. Moreover since the tree influences the soil, carbon is also stored in the soil in the form of humus.

i think the seedlings have to establish and grow so that the amount of carbon sequestered and stored can be calculated. the planting of tree seedlings doesn't have an automatic effect on reducing CC or GW.

To the question "How Impactful is planting trees in mitigating problems of climate change /global warming?" the direct answer is It is extremely impactful through multiple ways.

1, Serving as a sequester of atmospheric carbon and reducing the net emissions from the environment which are primarily responsible for global warming and ofcourse the climate change.

2. Forests greatly help in avoiding soil erosion and managing floods during rains.

3. Urban forests greatly help in reducing the heat island effect (as already highlighted earlier in the forum) and thereby the energy required for thermal comfort of buildings.

4. Helps in addressing food security.

5. IN summary they help in both mitigation and adaptation

plants are only solution to absorb pollutant (CO2) from air for photosynthesis and as nutrients from soil.

more planting protect our earth from pollutants in natural way without additional impact, all other technology will create side impact

iTree software can quantify the many ecological services provided by trees with economic implications that should foster an interest in trees planting and conservation. The attached paper is telling the story.

Bruno Borsari This paper is interesting and thanks for posting