[6] In Form 2,[2] he decided that he wanted to enter the Hong Kong Observatory while completing a stargazing Boy Scout badge, although he later believed that the chances were slim.

He obtained an A in Physics in the Hong Kong Certificate of Education Examination, although the grade was not sustained in the A-levels, where he received an A for all other subjects he took up.

[6] Lam said in an interview by the Wen Wei Po that his interest in bird-watching started when he saw birds in the Hong Kong Cemetery at Happy Valley when he was in his twenties.

[13] In January 2010, Lam criticised the government in his blog[21] for endorsing the building of houses in Long Valley by 'influential people' using the name of 'diversified development'.

On 4 February, Lam sent his position paper to departments of the Development Bureau as a resident, detailing arguments for the preservation of the Valley and raising questions about the government being 'soft' on 'influential people'.

[22] Lam also hosted the Radio Television Hong Kong Channel 1 show Sentient Beings from 3 July 2010 to 25 December of the same year.

As the president of the King's College Old Boy's Association, he wrote that the government was cutting back the opportunity for upward social mobility of students from grassroots families.

[24] Michael Suen, the Secretary for Education, replied that the chances would not be reduced as the total number of students were on a decreasing trend.

[25] Lam had been dismissive of man-made climate change until 2001, when he read the Third Assessment Report on global warming from IPCC publishings.

[2] In 2009, Lam, along with noted singer and environmental activist Lowell Lo, hosted '救亡16度', a documentary about global warming, for RoadShow.

[28] Lam also advocates against the use of air conditioners, due to their high electricity usage and release of chemicals into the environment, both of which contribute to global warming.