Group released a guide on pushing back against agencies pitching for the Shell global media account.
Extinction Rebellion targets energy giant over its pitch.
IPG's Initiative was appointed in 2017, replacing OMD.
Appointment follows a four-way competitive pitch.
By removing traditional approaches to recruitment, the ad industry can mitigate unconscious bias, Brixton Finishing School founder Ally Owen argues.
Media investors cited brand safety concerns and a lack of USP.
Top news, insights and analysis every weekday
Sign up for Campaign Bulletins