Critall windows date back to the 1880s but their steel construction makes them vulnerable to damp.| BBC News
Magnets are central to much modern technology and firms are racing to make them more efficient.| BBC News
The US government has directed unprecedented sums of money at green energy projects.| BBC News
At Ocado's newest warehouse robotic arms are helping to pack customer orders.| BBC News
Glass bottle makers are having to invest in new tech to cut their hefty CO2 footprint.| BBC News