The government has pledged to plant 30 million trees a year as part of the effort to tackle climate change.
Trees absorb carbon dioxide - the main gas heating the planet - so planting more of them is seen by many as a good solution.
At the moment, the UK's forests pull in about 10 million tonnes of carbon dioxide a year but the hope is to more than double that.
But planting trees is skilled and back-breaking work, not suited to everyone.
At top speed, Canadian Shelby Barber can plant more than 4,000 per day. BBC News followed her for a hard day's planting.
Source : BBC News - Science & Environment
Tree planting: 'I want to plant one million’
Tree planting: 'I want to plant one million’
