New Shell CEO has toughest task in European business

Meanwhile, Shell's investments in Canada's oil sands, a dirty, energy-intensive activity whereby crude is squeezed from bitumen-soaked soil, and a row back from investment in renewable energy, have prompted the ire of environmentalists.

ON THE OFFENSIVE

Shell has reacted to the attacks on its green record by going on the offensive.

After being rapped by Dutch and British advertising watchdogs for making unfounded environmental claims, the company has stopped focusing on green energy in its commercials.

Instead it is talking about its efforts, and the world's need, to make hydrocarbons greener.

Similarly, Voser, who is also a board member of Swiss bank UBS, is expected to go on the offensive against Shell's financial challenges.

Some oil executives have criticized Voser's lack of experience in exploration and production, traditionally the powerhouse of an oil company. Others say it is his strength.

"You have to have a clear view of the viability of what you're going into so you can chose between projects. It will be a great help to him to have a financial background," a senior Shell insider said.

Threadneedle's Thornber agreed, saying that Shell has often allowed its engineers too much free reign.

"The reputation in the industry is that Shell over-engineers solutions. They pursue engineering excellence possibly at the expense of shareholder return. A man with a finance background might make more rational decisions," he said.

(Editing by Sitaraman Shankar)