His research interests comprise, among others, variations in the magnetic fields of the Sun, interplanetary space, and the Earth and in general solar influence on global and regional climate.
His lectures, at the Saas-Fee Advanced Course The Sun, Solar Analogs and the Climate, together with contributions of such experts as Joanna Haigh and Mark Giampapa, were published as a book by Springer in 2006.
[6] He was partly inspired to conduct the study after seeing the Great Global Warming Swindle, which contends that the Sun is the primary cause of recent climate change.
[6] Lockwood told the New Scientist that he seriously doubted that solar influences were a big factor compared to anthropogenic influences: to explain the lack of global cooling since 1987 would require a very long response time to any solar forcing which is not found in detected responses to volcanic forcing.
[9][10] In 2012, Lockwood said the field of Sun-climate relations had been "corrupted by unwelcome political and financial influence as climate change sceptics have seized upon putative solar effects as an excuse for inaction on anthropogenic warming".