The petition also calls for support to local authorities in achieving this and urges the planting of native trees, and of fruit trees to provide a sustainable source of food.
The trust points to an i-Tree Eco-based study of Wrexham published last year, which found its trees saved the borough £1.3m a year in rainwater interception, CO2 and pollution absorption.
It has also highlighted figures published last year by Natural Resources Wales, showing dramatic variation in urban tree canopy cover, from 4.5 per cent in Fochriw, Caerphilly, to 34 per cent in Trimsaran, Carmarthenshire.
The trust's campaigns officer in Wales Angharad Evans said: "People often refer to the more attractive areas of towns as being 'leafy'. Areas like this can provide a more attractive and healthy environment for people to live and work in, for all kinds of reasons."
The Woodland Trust in Wales is also offering free packs of 30, 105 or 420 native trees to schools and community groups keen to plant them, and will be distributing free saplings to visitors at the Royal Welsh Show and the Eisteddfod this summer.
Woodland Trust cites i-Tree study in call to raise Wales' urban tree canopy
The Woodland Trust (in Wales, Coed Cadw) has launched a petition to the Welsh Assembly calling for a 20 per cent tree canopy cover target for all Wales' cities, towns and villages.
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