Planting of trees and shrubs in various urban gardens and local councils in Malta and Gozo

Country: Malta

City: Various locations

start: 2014

Timeframe: 5 years

Phase: Ongoing

Nature-based solutions (NBS) : Yes

Initiator: Ambjent Malta

Latitude: 35.8841

Longitude: 14.4928

Co-benefits

Improved air quality

Yes, tree and woodland cover was associated with air quality improvement ecosystem services (Balzan et al., 2018).

Reduced drought risk, cooling effect, urban heat island mitigation

Yes, trees and plants provide shade and reduce the urban heat island effect.

Increased quality and quantity of green and blue infrastructures

Yes, by increasing tree cover which would be expected to contribute to a stronger delivery of ecosystem services in urban areas (Balzan et al., 2018).

Improved aesthetic value

Yes

Original problems

Low air quality

National data indicates exceedances of the EU limit values have been observed for both ozone and particulate matter (PM10). PM10 exceedences are attributed to the combined effect of human caused (traffic congestion and to a minor extent power generation) and environmental factors (e.g. dust from the Sahara). Ozone is a transboundary pollutant arriving in Malta from Europe. The concentration of Nitrogen Dioxide (NO2) higher in traffic congested areas and may pose a significant problem in dense urban areas (ERA, 2018b).

Drought and heat risk

The Mediterranean Region is considered as a "hot-spot" of climate change, having been identified in global climate scenarios as one of the most responsive regions to climate change (Lionello and Scarascia, 2018). There is a consensus in scientific literature that average temperatures will rise across most of the Mediterranean Region, and that precipitation will decrease (Ulbrich et al. 2013; Lionello and Scarascia, 2018). Observed annual mean temperatures in the Mediterranean Region are now 1.4 °C higher than the average late-nineteenth-century levels particularly during the summer months (Cramer et al., 2018).

Low availability of green infrastructure

Yes, because of the lack of green areas and open spaces due to urban expansion and the growing number of people living in urban areas (ERA, 2018d). Densely populated urban areas were characterised by a lower availability of green infrastructure (Balzan et al., 2018).

Low aesthetic value

Yes

Limited knowledge about biodiversity

The Malta National Biodiversity Strategy and Action Plan (NBSAP) reports that the results of the Eurobarometer Surveys on Attitudes of Europeans towards Biodiversity in 2007 and 2010 indicate that 14.4% and 18% respectively of Maltese respondents had heard of the term “biodiversity” and knew what it meant. A survey commissioned by MEPA in 2011 indicates that out of the 500 persons interviewed, 24.6% of Maltese respondents heard of the term “biodiversity” and knew what it meant. In general there is a need to continue enhancing biodiversity awareness and gain more knowledge on the meaning of ‘biodiversity’ (ERA, 2018d).

SDGs

Sustainable cities and communities (SDG11)

Yes, tree cover and woodland habitats contribute significantly to ecosystem services capacity in urban areas, including air quality improvement and recreation (Balzan et al., 2018).

Reference: Balzan, M. V., Caruana, J., Zammit, A. 2018. Assessing the capacity and flow of ecosystem services in multifunctional landscapes: Evidence of a rural-urban gradient in a Mediterranean small island state. Land Use Policy, 75, 711–725. Retrieved from: doi:10.1016/j.landusepol.2017.08.025.

Cramer, W., Guiot, J., Fader, M., Garrabou, J., Gattuso, J.-P., Iglesias, A., Lange, M.A., Lionello , P., Llasat , M.C., Paz, S., Peñuelas, J., Snoussi, M., Toreti , A., Tsimplis, M.N., Xoplaki, E. 2018. Climate change and interconnected risks to sustainable development in the Mediterranean. Nature Climate Change. doi:10.1038/s41558-018-0299-2.

ERA. 2018b. State of the Environment Report 2018: Chapter 2: Ambient Air. Reporting status from 2009 to 2015. Information obtained: 2019-11-08. Available at: https://era.org.mt/en/Documents/3_Chapter2_AmbientAir_9Aug18.pdf.

ERA. 2018d. State of the Environment Report 2018: Chapter 8: Biodiversity. Reporting status from 2009 to 2015. Information obtained: 2019-11-08. Available at: https://era.org.mt/en/Documents/Chapter8_Biodiversity_04Dec18.pdf.

Lionello, P., Scarascia, L. 2018. The relation between climate change in the Mediterranean region and global warming. In Regional Environmental Change, 2018, Volume 18, Issue 5, pp 1481–1493.

Ulbrich U, Xoplaki E, Dobricic S, García-Herrera R, Lionello P, Adani M, Baldi M, Barriopedro D, Coccimiglio P, Dalu G, Efthymiadis D, Gaetani M, Galati MB, Gimeno L, Goodess CM, Jones PD, Kuglitsch FG, Leckebusch GC, Luterbacher J, Marcos-Moreno M, Mariotti A, Nieto R, Nissen KM, Pettenuzzo D, Pinardi N, Pino C, Shaw AGP, Sousa P, Toreti A, Trigo RM, Tsimplis M. 2013. Past and current climate changes in the Mediterranean region. In: Navarra A, Tubiana L (eds) Regional Assessment of Climate Change in the Mediterranean. Springer, Dordrecht, pp 9–52. doi:10.1007/978-94-007-5781-3_2.