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More proof carbon dioxide is essential to planetary health: Research finds urban trees are growing faster worldwide

Climate change alarmists are quick to point out what they perceive to be the negative effects of warmer temperatures, including droughts on one hand and excessive rainfall on the other. What they are not so quick to point out are the advantages of a warmer climate. One of these advantages was recently highlighted in a study conducted by researchers from the Technical University of Munich (TUM), which found that urban trees – which are exposed to warmer temperatures – are growing at a considerably faster rate than rural trees.

Urban areas are subject to what is known as the urban heat island (UHI) effect. Increased human activity in a confined area causes metropolitan areas to be considerably warmer than their surrounding rural neighbors. This increase in temperature can be as little as 3 degrees or as much as 10 degrees Fahrenheit.

With urban areas worldwide bursting at the seams and growing at an exponential rate, the research team, led by Professor Hans Pretzsch, wanted to examine the effects of the UHI effect on trees in these crowded environments.

The scientists collected heartwood samples from 1,400 mature trees in cities in different climate zones across the planet, including Cape Town, Hanoi, Berlin, Brisbane, Paris, Munich, Houston, Santiago de Chile, Prince George and Sapporo.



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