1) Technologists said that ash from waste combustion had to be sent to specially designed landfills.
2) А parliamentary committee made public statement that radioactive waste had been thrown into the sea by some old British nuclear power stations.
3) The placard demanded that solutions were to be found to traffic jams and air pollution in the city.
4) Ecologists asked the local authorities how much sulphur dioxide (SO2) the old power station in Yorkshire gave off.
5) The mayor says that the construction of a smart city on this island will not be cheap.