The environment correspondent is Helen.
A new study shows that climate change is threatening the health and survival of urban trees.
More than a thousand tree species are at risk due to climate change.
Better protection of existing trees is one of the things scientists would like to see.
Cities are more liveable because of the cooling effect of trees.
Many trees in urban areas are stressed because of climate change, and as it gets warmer and drier, the number of species at risk will increase.
He said that city and street trees can improve physical and mental health, are important in social integration, and can help mitigate the effects of temperature rises.
"All these benefits are provided by mature trees so we need to make sure that what we are planting today will get to that stage where they can provide all those benefits for future generations."
The impact of global warming on the trees planted along streets and in parks was assessed by the researchers using the Global Urban Tree Inventory.
More than half of the tree species in some cities are at risk due to rising temperatures and changing precipitation. The proportion is predicted to increase to more than two-thirds by the year 2050.
Climate risk for species is high in cities in tropical regions and in countries that are vulnerable to climate change.
The researchers looked at five cities in the United Kingdom.
Climate change is expected to have a big impact on trees in York, London and other areas.
The research is in a journal.
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