A/RES/68/141 Office of the United Nations High Commissioner for Refugees 34. Notes the importance of States and the Office of the High Commissioner discussing and clarifying the role of the Office in mixed migratory flows, in order to better address protection needs in the context of mixed migratory flows, bearing in mind the particular needs of vulnerable groups, especially women, children and persons with disabilities, including by safeguarding access to asylum for those in need of international protection, and also notes the readiness of the High Commissioner, consistent with his mandate, to assist States in fulfilling their protection responsibilities in this regard; 35. Emphasizes the obligation of all States to accept the return of their nationals, calls upon States to facilitate the return of their nationals who have been determined not to be in need of international protection, and affirms the need for the return of persons to be undertaken in a safe and humane manner and with full respect for their human rights and dignity, irrespective of the status of the persons concerned; 36. Expresses concern about the challenges associated with climate change and environmental degradation to the operations of the Office of the High Commissioner and the assistance it provides to vulnerable populations of concern across the globe, particularly in the least developed countries, and urges the Office to continue to address such challenges in its work, within its mandate, and in consultation with national authorities and in cooperation with competent agencies in its operations; 37. Urges all States and relevant non-governmental and other organizations, in conjunction with the Office of the High Commissioner, in a spirit of international solidarity and burden-sharing, to cooperate and to mobilize resources, including through financial and in-kind assistance as well as direct aid to host countries, refugee populations and communities hosting them, with a view to enhancing the capacity of and reducing the heavy burden borne by countries and communities hosting refugees, in particular those that have received large numbers of refugees and asylum seekers, and whose generosity is appreciated; 38. Calls upon the Office of the High Commissioner to continue to play its catalytic role in mobilizing assistance from the international community to address the root causes as well as the economic, environmental and social impact of largescale refugee populations in developing countries, in particular the least developed countries, and countries with economies in transition, and notes with appreciation those donor States, organizations and individuals that contribute to improving the condition of refugees who remain vulnerable members of society; 39. Expresses deep concern about the existing and potential challenges posed by the world financial and economic crisis to the activities of the Office of the High Commissioner, and calls upon the Office to further explore ways and means to broaden its donor base so as to achieve greater burden-sharing by reinforcing cooperation with governmental donors, non-governmental donors and the private sector; 40. Recognizes that adequate and timely resources are essential for the Office of the High Commissioner to continue to fulfil the mandate conferred upon it through its statute 7 and by subsequent General Assembly resolutions on refugees and other persons of concern, recalls its resolutions 58/153 of 22 December 2003, _______________ 7 6/7 Resolution 428 (V), annex.