Increase of the ambient air temperature in cities caused by the urban heat island phenomenon has a seri- ous impact on the economic and social system of cities. to counterbalance the consequences of the increased urban temperatures important research has been carried out resulting in the development of efficient mitigation technologies. the present paper aims to present the state of the art in terms of local climate change and urban heat island mitigation techniques. In particular, developments in the field on highly reflective materials, cool and green roofs, cool pavements, urban green and of other mitigation technologies are presented in detail, while examples of implemented projects are given.

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-This work presents an experimental study of purification of a biogas by removal of its hydrogen sulphide (H 2 S) content. The H 2 S was removed by means of chemical absorption in an iron-chelated solution catalyzed by Fe/EDTA, which converts H 2 S into elemental sulphur (S). Preparation of the catalyst solution and the results of biogas component absorption in the catalyst solution (0.2 mol/L) are presented. These results are compared with those for physical absorption into pure water under similar conditions. Experimental results demonstrate that, under the same experimental conditions, a higher percentage of H 2 S can be removed in the catalytic solution than in water. In a continuous counter current using adequate flowrate phases contact at room temperature and low gas pressure, the results demonstrate that is possible to totally remove the H 2 S from the biogas with the prepared catalytic solution.

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