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Get talking - Geoengineering and HS2

Would HS2 gain more supporters if it could be seen to be groundbreaking in some technological way that might spin off elsewhere? Geoff Snape thinks so
Traffic jam on the M25

Actions of consequence

Fred discusses diesel cars and their unintended consequences

Material of the month: PVC

The history, production and applications of PVC are examined by Rhiannon Garth Jones

Progress on processes

Rhiannon Garth Jones looks at developments in production technology.