The National Climate Assessment (NCA) is a report mandated by congress at least every four years to assesses the science of climate change and variability and its impacts across the United States, now and throughout this century. The Fourth NCA was release November 23, 2018. Chapter 22 focuses specifically on the Northern Great Plains Region and Chapter 15 is specific to Tribes and Indigenous Peoples.
ITEP’s mission is to strengthen tribal capacity and sovereignty in environmental and natural resource management through culturally relevant education, research, partnerships and policy-based services. ITEP envisions a healthy environment for strong, self-sustaining tribal communities. ITEP's website has a wealth of information for climate change efforts including templates, resources, and points of contact for further information regarding tribal climate adaptation.
The Fort Laramie Treaty of 1851 was signed on September 17, 1851, between United States treaty commissioners and representatives of the CheyenneSiouxArapahoCrowAssiniboineMandanHidatsa, and Arikara Nations. The treaty states that the US acknowledges that all the land covered by the treaty was Indian territory and could not claim any part of it. 
The treaty established the Great Sioux Reservation including ownership of the Black Hills. It was negotiated by members of the government-appointed Indian Peace Commission, and signed between April and November 1868 at and near Fort Laramie in the Wyoming Territory.

The HPRCC provides the public with several ways to access climate data and information. Whether via direct contact, website access, or through a subscription to one of HPRCC’s online services, users can acquire a variety of climate data products, such as:

• Near Real-Time and Historical Climate Data

• National and Regional Climate Data Maps

• Agricultural Climate Products

• Monthly, Quarterly, and Annual Regional Climate Summaries

The Tribal Climate Change Guide is part of the Pacific Northwest Tribal Climate Change Project. It is a comprehensive guide to climate change events, resources, and funding opportunities. It is run by Kathy Lynn out of the University of Oregon.
Tribal nations have been actively engaged in efforts to understand climate risks to their natural and cultural resources, and what they can do to prepare. We have carefully selected a suite of resources that may be useful to tribes at each stage in the process of evaluating their vulnerability to climate change—from tribes just getting started to those well on their way.