I'd be doing less good with my life if I hadn't heard of effective altruism

my decisions to give 10% of my salary to effective causes, and my decision to work in AI were both strongly influenced by EA

Morality is Objective

Like this slider- objectivity is a spectrum. The most subjective thing possible is a pure taste satement 'I like ice-cream'. A pure objective statement is '1+1=2'. 

In the world of inter-subjectivity there are statements like 'Democracy is superiour to dictatorship'. This has elements of both objectivity and subjectivity. 

I think morality is an intersubjective agreement (hence the influence of culture) but supported by biological roots (we possess a biological distaste for suffering and injustice, and a biological capacity for abstract reasoning). These intersubjective agreements combined with objective biological dispositions result in something which is not as objective as mathematics or natural sciences, but possesses a degree of objectivity.

I buy into MacAskill's argument that the 20th-21st centuries appear to be an era of heightened existential risk, and that if we can survive the development of nuclear, AI and engineered biology technologies there will be more time in the future to increase the value where we survive.