Yasar Sharfudeen

@newbie2k25.bsky.social

Day 28 #30DayChartChallenge — Modeling Five futures, one planet Three demographic models project vastly different 2100s: UN (peak 10.3B in 2083), IHME (peak 9.7B in 2065, then decline), and Wittgenstein SSPs (9.2B to 13.1B). Data: UN WPP 2024 · IHME GBD 2020 · Wittgenstein SSPs Made with R + ggplot2

Line chart on a dark navy background titled "Five futures, one planet." World population from 1950 to 2100 in billions. A single white line shows observed history rising from 2.5 B in 1950 to 8.1 B in 2023. From 2023 the line splits into five projection paths: a coral UN WPP 2024 line peaking at 10.3 B around 2083 and ending at 10.2 B in 2100, surrounded by an 80 % and 95 % prediction-interval ribbon that fans outward; a blue IHME GBD 2020 line peaking earlier at 9.7 B in 2065 and falling to 8.8 B in 2100, with its own pale-blue 95 % uncertainty ribbon; three Wittgenstein SSP scenarios — green SSP1 declining to 8.0 B, yellow-green SSP2 ending at 9.9 B, and amber SSP3 still rising to 13.1 B at 2100. Each line is labelled at its 2100 endpoint with the model name and final value. The UN's 95 % prediction interval visibly brackets most of the disagreement between models. Sources noted at bottom: UN World Population Prospects 2024, IHME Vollset et al. 2020, and Wittgenstein Centre Data Explorer v3.

Day 25 #30DayChartChallenge — Space 6,197 confirmed exoplanets. 5,498 plotted. The bright cluster shows where our instruments see easily. The dark void at lower-right — Earth-size planets with year-long orbits — is nearly invisible to us. Data: NASA Exoplanet Archive Tools: R + ggplot2 + hexbin

Hexbin plot of confirmed exoplanets by orbital period and radius, highlighting detection bias: bright clusters mark common discoveries, while small long-orbit planets are mostly missing from current observations.

Day 18 #30DayChartChallenge — UNICEF Data Day A map of childhood lead exposure: ~800M children worldwide have blood lead levels above 5 µg/dL — the threshold for cognitive harm. India alone accounts for 275M, 34% of the global total. Data: UNICEF & Pure Earth (IHME GBD 2017) R + ggplot2 + sf

A world choropleth map titled "275 Million Children in India Have Lead Poisoning." Countries are shaded by estimated number of children (0–19) with blood lead level above 5 µg/dL, from pale yellow (under 100K) through gold, orange, red-orange to deep red (over 50 million). India is the only country in the deepest-red bin. Most of Africa, South Asia and the Middle East are in mid-orange to red shades. North America, Europe and East Asia appear in lighter shades. A white callout marks India: "275 million children · 34% of global total."