"When it comes to going green, the parties are competing to see who can make the most unrealistic promises.
Fortunately the most likely government, the Tories, are currently losing this bidding war, promising policies that are only mildly barmy and unaffordable.
The big green issue is the date by which the country must go zero-carbon.
The Tories have promised 2050 and passed it into law.
The Liberal Democrats say 2045.
Labour’s manifesto is likely to say the 2030s.
The Green Party promises 2030 itself, thus disappointing the yoga-protesters in Extinction Rebellion, who demand 2025.
What none of them say is how they will get there..."
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