The Summit was held in Johannesburg in 2002. I couldn't find a specific designer, but it seems there was a contest for the design.
What I love about this logo is how the dove is also a hand tenderly cupping the globe. The solid form of the bird/hand conveys a sense of weight, a solid foundation on which to build. The open lines of the globe convey a sense of fragility, something that must be handled with care, and the sprouting plant conveying growth that's nurtured in a balanced way (the symmetry of the leaves, and the sense of containment within the form of the globe)
Overall, it really works to convey the message of peace and the thoughtful stewardship of our home planet.
