Greening 30% of urban areas will reduce street temperatures by 0.4°C and almost halve mortality from summer heat waves, said Spanish scientists during modeling scenarios based on indicators of 93 European cities in 2015, The Guardian reported.

Researchers say: it is not necessary to demolish houses for the sake of new parks, there is enough space for trees as it is. Southern and Eastern European cities need greenery most of all now.

For example, in the Romanian Cluj-Napoca in 2015 recorded the most premature deaths due to heat - 32 cases per 100,000 people. The area of green spaces in the city is 7%. In Lisbon this figure is 3.6%, in Barcelona - 8.4%, in London - 15.5%, in Oslo - 34%.