Why are there so few lapwings left in the UK?
Do second flushes of spring blooms signal changing seasons?
Which plants absorb carbon dioxide from the atmosphere most effectively?
Could large numbers of wind turbines affect our climate?
Has breeding docile honey bees weakened them?
How do ground-nesting birds avoid detection by predators?
What challenges face market towns in the modern world?
Will it ever be viable to grow seaweed to make into petrol?
With Richard Daniel. Is it viable to grow coppiced woodland along Britain's roads?
With Richard Daniel. Is pollution from leisure craft damaging the environment?