For more information on 1Sky Action Fund, see 350 Action (Nonprofit)
1Sky Action Fund was the 501(c)(4) advocacy arm of the environmentalist organization 1Sky. The 1Sky groups merged with the left-wing environmentalist nonprofit 350.org and its affiliate 350 Action in 2011.  Although 1Sky maintains an online presence, all of its financials, including donations and federal filings are made through 350.org. 
The last federal tax filing under the name 1Sky Action Fund appears to be for the year 2010.  The group reported $180 in revenue,  just under $3,000 in expenses,  and just under $64,000 in assets.