Technology'Formula Zero' kart race could drive fuel cell technology Go-karts powered by hydrogen fuel cells compete in the first 'Formula Zero' race, which may one day be a green alternative to 'Formula 1' races ¿ìè¶ÌÊÓÆµ
TechnologyLondon congestion charge did not improve air quality The policy of charging drivers to enter London city centre has cut traffic, but air quality has changed little, with some pollutants actually rising ¿ìè¶ÌÊÓÆµ