claim: A drop of volcanic activity in the early 20th century may have had a warming effect.
evidences.evidence_id: 1257 Samalas eruption:133
evidences.article: 1257 Samalas eruption
evidences.evidence: Sea surface temperatures too decreased by 0.3–2.2 °C (0.54–3.96 °F), triggering changes in the ocean circulations.
evidences.votes: REFUTES NOT_ENOUGH_INFO
evidences.evidence_id: African humid period:479
evidences.article: African humid period
evidences.evidence: In addition, the end of the 20th century drying trend may be due to global warming.
evidences.votes: REFUTES NOT_ENOUGH_INFO
evidences.evidence_id: Climate change (general concept):98
evidences.article: Climate change (general concept)
evidences.evidence: Notable eruptions in the historical records are the 1991 eruption of Mount Pinatubo which lowered global temperatures by about 0.5 °C (0.9 °F) for up to three years, and the 1815 eruption of Mount Tambora causing the Year Without a Summer.
evidences.votes: REFUTES SUPPORTS
evidences.evidence_id: Cloud:326
evidences.article: Cloud
evidences.evidence: Most of the sunlight that reaches the ground is absorbed, warming the surface, which emits radiation upward at longer, infrared, wavelengths.
evidences.votes: REFUTES NOT_ENOUGH_INFO
evidences.evidence_id: Lake Tahoe:247
evidences.article: Lake Tahoe
evidences.evidence: Analysis of the temperature records in Lake Tahoe has shown that the lake warmed (between 1969 and 2002) at an average rate of 0.027 °F (0.015 °C) per year.
evidences.votes: REFUTES NOT_ENOUGH_INFO