In the first half of 2013, house building activities in China increased so much that imports of timber have grown significantly. The biggest exporters of timber are Russia and Canada, while New Zealand is the biggest exporter of logs. Timber suppliers are now becoming aware of the export possibilities, but ocean freight lines have to be aware of the problems associated with sourcing timber. Last year a shipping line was criticised by environmental groups for carrying 275 containers of rosewood which had been felled in a protected area.