What factors underlie the differential in fuel duty between private bus companies and private rail companies. - Includes figures.

What factors underlie the differential in fuel duty between private bus companies and private rail companies. - Includes figures.

What size of served population gives rise to a requirement for additional sewerage treatment before the discharge into the sea; and over what period such population figures are calculated. - Inc figs.

What size of served population gives rise to a requirement for additional sewerage treatment before the discharge into the sea; and over what period such population figures are calculated. - Inc figs.

What studies he has made of the refusal of households to connect to first time sewage schemes.

What studies he has made of the refusal of households to connect to first time sewage schemes.

What plans he has to make connection to adopted sewers compulsory for households in areas with (a) sensitive aquifers and (b) pollution of streams and waterways.

What plans he has to make connection to adopted sewers compulsory for households in areas with (a) sensitive aquifers and (b) pollution of streams and waterways.

If he will list the main requirements of his inspectors for flagging in, broken down into numbers per year by vessel type. - Inc table.

If he will list the main requirements of his inspectors for flagging in, broken down into numbers per year by vessel type. - Inc table.

Who supplied and manufactured the oil skimming equipment handed over by the Parliamentary Under Secretary of State in Bahrain last week. - (Holding answer 22 March 1991).

Who supplied and manufactured the oil skimming equipment handed over by the Parliamentary Under Secretary of State in Bahrain last week. - (Holding answer 22 March 1991).

How much dispersant the Marine Pollution Control Unit keeps in stock expressed in (a) value in # sterling, (b) weight and (c) volume; what were the stocks in each of the last five years; and what was the capital expenditure of the Unit for each of the last five years...

How much dispersant the Marine Pollution Control Unit keeps in stock expressed in (a) value in # sterling, (b) weight and (c) volume; what were the stocks in each of the last five years; and what was the capital expenditure of the Unit for each of the last five years...

What is the contingency fund (a) held and (b) expended for oil spill recovery for the last five years - Incl table & figures.

What is the contingency fund (a) held and (b) expended for oil spill recovery for the last five years - Incl table & figures.

If his Department has carried out any assessment of the total world market for oil spill recovery equipment and technology and as to where the United Kingdom ranks in that market.

If his Department has carried out any assessment of the total world market for oil spill recovery equipment and technology and as to where the United Kingdom ranks in that market.

What studies he has made of the effect of a pollution tax on (a) fossil fuels and (b) fossil fuels used to supplement electricity generation under the Non Fossil Fuel obligations. - Inc ref to Cm 1200.

What studies he has made of the effect of a pollution tax on (a) fossil fuels and (b) fossil fuels used to supplement electricity generation under the Non Fossil Fuel obligations. - Inc ref to Cm 1200.

If there are any plans to follow up the discovery by the RRS Charles Darwin that biological production of nitrous oxide in the oceans is contributing to global warming.

If there are any plans to follow up the discovery by the RRS Charles Darwin that biological production of nitrous oxide in the oceans is contributing to global warming.

Statement on results of recently completed surface water acidification programme

Statement on results of recently completed surface water acidification programme

If UK's preparedness to deal with an oil spill at sea has been reviewed in light of recent tanker accidents.

If UK's preparedness to deal with an oil spill at sea has been reviewed in light of recent tanker accidents.

When Sec of State last commissioned a study into dog whelk population; what signs there are that the TBT ban has led to a recovery of the dog whelk; & to list those areas where dog whelk population is showing a substantial increase.

When Sec of State last commissioned a study into dog whelk population; what signs there are that the TBT ban has led to a recovery of the dog whelk; & to list those areas where dog whelk population is showing a substantial increase.

To set out the research & findings that have been given by Warren Springs laboratories on carbon dioxide emissions from vehicles with & without catalytic converters.

To set out the research & findings that have been given by Warren Springs laboratories on carbon dioxide emissions from vehicles with & without catalytic converters.

To list those vessels that carry or can be converted to carry oil spill dispersant which MAFF operates

To list those vessels that carry or can be converted to carry oil spill dispersant which MAFF operates

What estimates have been made of reduction of carbon dioxide from condensate boilers.

What estimates have been made of reduction of carbon dioxide from condensate boilers.

To give latest estimate of hydrocarbons that evaporate from bitumen emulsifiers. - Ref to 157 c786-7W (holding answer 26 July 1989).

To give latest estimate of hydrocarbons that evaporate from bitumen emulsifiers. - Ref to 157 c786-7W (holding answer 26 July 1989).

What studies have been made of environmental improvement to atmosphere that would be achieved if county council surveyors specified polymer modified bitumens

What studies have been made of environmental improvement to atmosphere that would be achieved if county council surveyors specified polymer modified bitumens