Dive summary:

• Meeting more rigorous emission standards for engines is clearly a goal of Caterpillar, Britain's JCB and other manufacturers for heavy equipment they will roll out at the industry show called "bauma 2013" and slated for April 15-21 in Munich Germany.
• Getting more efficiency from the cleaner-powered machines is a popular target, too, such as Caterpillar's hybrid excavator that captures energy displaced when braking the movement of the boom and uses it for the next acceleration.
• Liebherr says it has something similar to show in a crawler crane that uses hydraulic ednergy storage.

From the article:

The German manufacturer Liebherr will be presenting a hybrid solution for heavy-duty applications with its HS 8300 HD Duty Cycle Crawler Crane. ...