Guides & How-tos · Worked examples · Real numbers

Sustainability guides

Step-by-step how-tos, head-to-head comparisons and honest roundups — every guide worked through with current figures, then backed by a RECATOOLS calculator or AI-directory entry so you can act on it.

185 guides published 15 topic areas Latest guide Aug 2026

All 185 AI & ML 47 Finance 27 Cybersecurity 24 Developer Tools 20 Science 10 Sustainability 4

A tiled roof and the length of guttering along its edge, seen from below against a clear sky.

Sustainability 7 min

Annual Rainfall Will Not Size Your Tank

Singapore and Manila are within five per cent of each other on annual rainfall, and their driest months are 112 mm and 8...

Nadia Rahim

Pub. 14 Aug

Two cupped hands holding a clump of soil with a small newly sprouted seedling growing from it.

Sustainability 6 min

What Does "Plant a Tree to Offset It" Actually Buy?

Carbon calculators end by translating your emissions into trees, and the unit that translation produces is the tree-year...

Nadia Rahim

Pub. 13 Aug

An aerial view of a multi-level motorway interchange carrying light traffic, with trees between the ramps.

Sustainability 5 min

Flying Against Driving, and the Units Nobody Checks

Both confident answers to this question are built on comparing a per-passenger figure with a per-vehicle one. Divide the...

Nadia Rahim

Pub. 13 Aug

Solar panels covering the tiled roof of a single-storey tropical house at golden hour, palms and neighbouring rooftops behind, under a deep navy sky.

Sustainability 11 min

Solar Payback on a Tropical Roof

Malaysia gets more sun than Singapore, and our own calculator duly reported that a Malaysian roof paid for itself faster...

Daniel Koh

Pub. 29 Jul