to think that we can stop a volcano... 

first, the proposal is: 

A plan to drop concrete balls into the mouth of a "mud volcano" in East Java to stem its flow should go into action next week, Indonesian scientists say.

you hear right.... 

Hot mud and gas have been spewing out of the ground since May 2006; experts warn the torrent could continue for months, if not years, to come. But the government-approved scheme could halt the flow within two to three months, the team behind the plan says.

Engineers will drop 1,000 1.5m-long metal chains into the mouth of the mud leak. Each chain has four concrete balls suspended from it; two with a 20cm diameter and two with a 40cm diameter.

They will begin slowly, Dr Fauzi explained; perhaps dropping five to 10 chains on the first day, then slowly increasing the number until they insert up to 50 chains per day.

and just in case you think we're joking: 

The concrete balls method would cost less than other proposed schemes to halt the mud volcano, Dr Fauzi said. Brian Simpson, an engineer from Arup Geotechnics, said the plan was a "long shot" and would have to overcome many difficulties.

surely, you jest! Stop a volcano? The nerve of some people. This plan is a long shot?  REALLY??!

here's the link to the entire article: