Couple such capability with new satellite measurements (America's Orbiting Carbon Observatory 2 is due to launch in a few years) and better measurements of the mass of plant life in forests and other ecosystems, and the planet's greenhouse-gas credits and debits will surely be understood far better.

ECONOMIST: Greenhouse-gas monitoring

But Holy Week, the Christian festival that commemorates the last week of Jesus' life, is a solemn celebration, and once mass begins, a calm settles over the congregation.

BBC: Easter in Rome

In a unique balance, the villages have found a way to both expose and protect their way of life, sharing profits equally while avoiding mass commercialisation.

BBC: In Oaxaca, a community unchanged