PricewaterhouseCoopers in the UK has asked its top travellers to cut their trips by 20%.
The request has gone out to 1,300 of the consulting company's major travellers.
The move is part of PwC's policy on corporate responsibility aimed at cutting its carbon emissions.
Samantha van Leeuwen, PwC's head of UK hotels and venues, said the travellers "had taken this a lot better than we thought."
She added: "We were very unsure but the travellers have really taken it to task and it has become a little bit of a competition among the team leaders to see who can do best."
Ms van Leeuwen was speaking at a conference in London organised by the UK and Ireland Institute of Travel Management (ITM) and the UK chapter of Meeting Professionals International (MPI).
Earlier Ms van Leeuwen said that PwC had now sent questionnaires to leading hoteliers asking them for their policy on green issues and it would be grading them according to their replies.
She said it was not always possible to organise a completely green meeting. But there were things a company could do to make a meeting greener.
These included engaging suppliers and the venue right from the start, encourage attendees to use alternative transport to flying, communicate with the delegates on what the green objectives are before the event and, at the meeting, provide equipment like re-cycling bins and use fair-trade products.
She said at a recent PwC event, staff travelling fewer than 300 miles were told to use the train, all food was bought locally rather than from supermarkets and everything used, including the stage, was later re-cycled.
She said the challenges for organising greener meeting was the unawareness of delegates and the suppliers.
"But nothing changes overnight," Ms van Leeuwen said. "Tracking emissions is a real problem. We do have to get our suppliers to measure their emissions.
"The MI from video-conferencing is also poor. How much do you save compared with travelling?"
Jennifer Charlton, director of UK business development for Carlson Wagonlit Travel, said that the need for meetings was not in doubt.
It was their frequency, pattern and format that had to change.
She said that relatively few companies issued RFP for meetings which had any green questions while data from hotels was difficult to analyse.
But Ms Charlton said that making "green" decision was often commons sense. If asked to choose between a luxury hotel in Dubai or a luxury hotel in the English countryside, it was not hard to decide which would be better the environment.
Also from the conference:
The challenges in drawing up a European meetings policy
Pharmaceutical giant Pfizer faced a range of challenges when drawing up a European-wide meetings programme, Andrew Gilkerson told the delegates.
Mr Gilkerson, sourcing specialist for meetings, congresses and event at Pfizer European procurement, said it was a not a question of "scaling up the UK policy and using it there – you can't do that."
He said each country had different laws and did things differently.
"We aimed to get a preferred vendors list but each country had very different needs. It was question of bringing common sense into the procurement environment.
"We had to ask 'how will that work in France, the UK, regionally?'
"There was also the challenge of tracking the spend in hotels in different countries. We will need to role out a single tool to do that," he said.
Mr Gilkerson said there was also a problem having a standard contract as the countries Pfizer worked in in Europe were 22 different legal entities.
But he said Pfizer was now seeing success in Europe country by country.
"You have to find out what is best practice in different countries and then trying to bring them together. For us it was about getting our house in order country by country."
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