In an article written by Bloomberg, Mark Lutes has been quoted as saying that “it will be very disappointing in Brazil does not join the ICAO from the outset”

The actual quote is below:-

Brazil, currently responsible for less than 1 percent of global aviation emissions, is seen as key to the effort’s success because its aviation industry is forecast to nearly double in terms of passengers by 2034, according to the International Air Transport Association. Mark Lutes, senior global climate policy adviser at WWF International, said it would be disappointing if Brazil doesn’t join the accord at the outset.

 “If countries like Brazil don’t participate, we will have to admit we won’t meet our goals,” Lutes said.
The full article can be linked to here:-
http://www.bloomberg.com/news/articles/2016-09-15/brazil-will-wait-to-join-airline-emissions-deal-official-says