Private investments in the clean tech industry totaled $1.76 bil, up 56% from Q1, according to a report from the Cleantech Group, a business intelligence and consulting firm. N. America-based companies were the largest recipients of the funding, raising $1.25 bil, up 74% from Q1. Calif. firms led the way with $631.4 mil. Asia-Pacific-based firms were No. 2 with $267.6 mil, followed closely by firms in Europe and Israel, which raised $235.7 mil.