Mid-to-high-latitude forests have a much lower albedo during snow seasons than flat ground, thus contributing to warming.
mˈɪdtəhˈaɪlˈæɾɪtˌuːd fˈɔːɹɪsts hæv ɐ mˈʌtʃ lˈoʊɚɹ ælbˈiːdoʊ dˈʊɹɹɪŋ snˈoʊ sˈiːzənz ðɐn flˈæt ɡɹˈaʊnd, ðˈʌs kəntɹˈɪbjuːɾɪŋ tə wˈɔːɹmɪŋ.