By Anja Rammig, Tim Jupp, Kirsten Thonicke, Britta Tietjen, Jens Heinke, Sebastian Ostberg, Wolfgang Lucht, Wolfgang Cramer and Peter Cox.

ECONOMIST: Sources and acknowledgments

Owners, Britta and Kent Lindvall invited designers and architects to create a series of unique tree houses that reflect -- in some cases literally -- the growing popularity of ecologically-themed holidays.

CNN: Modern design meets nature with Sweden's Treehotel

"That said, we feel there is going to be an awful lot of organic growth in public places, " said Britta Gross, General Motors' director of global energy systems and infrastructure commercialization.

CNN: The new fear: Electric car 'range anxiety'

To make growing your own food easier and more accessible, founder Britta Riley invited top industrial designers and engineers to design beautiful and easy to use systems made from environmentally friendly materials.

FORBES: Connect

Rob Peterson and Britta Gross of GM, both integral to the Volt program, dare me to guess when the car switches from battery-only to using the gas engine as a generator, and I totally miss it.

FORBES: Chevy Volt Named Car Of The Year -- Twice

Only two are allowed to progress into the semi-finals, Marleen Veldhuis, who anchored the relay team to victory on Tuesday showed every sign of breaking the world record in the semi-finals but went out more slowly this time and was well shy of Britta Steffen's mark.

BBC: What do they say about the best laid plans?