diff --git a/README.md b/README.md
index 6438c52..baa90c1 100644
--- a/README.md
+++ b/README.md
@@ -64,6 +64,8 @@ atmosphere:
 climate:
   - NOAA_correlation
   - NOAA_correlation_xr
+  - Global_Carbon_Budget_2025
+  - Global_Carbon_Budget_2021
 
 shapefiles:
   - Countries
@@ -93,8 +95,28 @@ import intake
 cat = intake.open_catalog('https://raw.githubusercontent.com/aaronspring/remote_climate_data/master/master.yaml')
 cat.atmosphere.HadCRUT5.to_dask()
 ```
+```
+<xarray.Dataset> Size: 42MB
+Dimensions:           (time: 2028, latitude: 36, longitude: 72, bnds: 2)
+...
+```
+
+```python
+import hvplot.pandas
+gcb = cat.climate().Global_Carbon_Budget_2025.read()
+gcb.hvplot(y=['fossil emissions excluding carbonation', 'land-use change emissions',
+               'atmospheric growth', 'ocean sink', 'land sink'],
+           title='Global Carbon Budget 2025')
+gcb
+      fossil emissions excluding carbonation  ...  budget imbalance
+Year
+1959                                2.416788  ...          1.168380
+...
+2024                               10.534546  ...         -1.691863
+[66 rows x 7 columns]
+```
 
-To explore the whole catalog, you can try:
+Explore the whole catalog:
 ```python
 cat.walk()
 ```
@@ -115,7 +137,7 @@ Make data access for climate data easy:
 - [`intake_xarray`](https://intake-xarray.readthedocs.io/en/latest/) for:
   - `nc` using [`netcdf4`](https://github.com/Unidata/netcdf4-python) [[example](https://github.com/aaronspring/remote_climate_data/blob/1209c5ebf5877b09b4403ea60da6d97b374b7b5c/catalogs/atmosphere.yaml#L64)]
   - `tif` using [`rioxarray`](https://github.com/corteva/rioxarray) [[example](https://github.com/aaronspring/remote_climate_data/blob/1209c5ebf5877b09b4403ea60da6d97b374b7b5c/catalogs/humans.yaml#L42)]
-- [`intake_excel`](https://github.com/edjdavid/intake-excel) for Excel `xls` and `xlsx` [[example](https://github.com/aaronspring/remote_climate_data/blob/1209c5ebf5877b09b4403ea60da6d97b374b7b5c/catalogs/climate.yaml#L35)]
+- [`intake_excel`](https://github.com/edjdavid/intake-excel) for Excel `xls` and `xlsx` [[example](https://github.com/aaronspring/remote_climate_data/blob/1209c5ebf5877b09b4403ea60da6d97b374b7b5c/catalogs/climate.yaml#L35)] (see [`excel_source.py`](remote_climate_data/excel_source.py) for custom driver if package unavailable)
 - [`intake_geopandas`](https://github.com/intake/intake_geopandas) for shapefiles `shp` [[example](https://github.com/aaronspring/remote_climate_data/blob/1209c5ebf5877b09b4403ea60da6d97b374b7b5c/catalogs/shapefiles.yaml#L11)], GeoJSON `geo.json` [[example](https://github.com/aaronspring/remote_climate_data/blob/1209c5ebf5877b09b4403ea60da6d97b374b7b5c/catalogs/shapefiles.yaml#L57)], GeoParquet `parquet`, `PostGIS` databases, `Spatialite` databases
 - [`regionmask`](https://regionmask.readthedocs.io/) for aggregating over geoshapes
 
diff --git a/catalogs/climate.yaml b/catalogs/climate.yaml
index bdf5a0e..aee1538 100644
--- a/catalogs/climate.yaml
+++ b/catalogs/climate.yaml
@@ -2,7 +2,38 @@
 plugins:
   source:
     - module: intake_xarray
+    - module: remote_climate_data
 sources:
+  Global_Carbon_Budget_2025:
+    description: Global Carbon Budget 2025
+    metadata:
+      url: https://globalcarbonbudget.org/
+      doi:
+        - https://doi.org/10.5194/essd-2025-659
+        - https://doi.org/10.18160/gcp-2025
+    driver: excel_url
+    args:
+      urlpath: simplecache::https://data.icos-cp.eu/licence_accept?ids=%5B%22UtUDiUg-PuYWkAiHoUNn83e0%22%5D
+      sheet_name: Global Carbon Budget
+      header: 21
+      index_col: Year
+      skipfooter: 0
+
+  Global_Carbon_Budget_2021:
+    description: Global Carbon Budget 2021
+    metadata:
+      url: https://www.globalcarbonproject.org/carbonbudget/
+      doi:
+        - https://doi.org/10.5194/essd-2021-386
+        - https://doi.org/10.18160/gcp-2021
+    driver: excel_url
+    args:
+      urlpath: simplecache::https://data.icos-cp.eu/licence_accept?ids=%5B%220ST81nXCND5VfAQdOCSJDveT%22%5D
+      sheet_name: Global Carbon Budget
+      header: 20
+      index_col: Year
+      skipfooter: 0
+
   NOAA_correlation:
     description: climate indices from psl.noaa.gov/data/correlation
     metadata:
diff --git a/remote_climate_data/__init__.py b/remote_climate_data/__init__.py
index 892fafb..3d22125 100644
--- a/remote_climate_data/__init__.py
+++ b/remote_climate_data/__init__.py
@@ -1,8 +1,10 @@
 import intake
 
+from remote_climate_data import excel_source  # noqa: F401
+
 
 def cmor_cat(cat="../master.yml", keyword="cmor", depth=3):
     if isinstance(cat, str):
         cat = intake.open_catalog(cat)
-    assert isinstance(cat, intake.catalog.local.YAMLFileCatalog)  # type: ignore[attr-defined]
-    return intake.Catalog.from_dict(cat.search(keyword, depth=depth).walk())  # type: ignore[call-arg, union-attr]
+    assert isinstance(cat, intake.catalog.local.YAMLFileCatalog)
+    return intake.Catalog.from_dict(cat.search(keyword, depth=depth).walk())
diff --git a/remote_climate_data/excel_source.py b/remote_climate_data/excel_source.py
new file mode 100644
index 0000000..e86fbc2
--- /dev/null
+++ b/remote_climate_data/excel_source.py
@@ -0,0 +1,73 @@
+import io
+
+import intake
+import intake.source
+
+
+class ExcelSource(intake.source.base.DataSource):
+    """Intake source for reading Excel files from URLs.
+
+    Supports simplecache:: prefix for caching.
+    """
+
+    container = "dataframe"
+    name = "excel_url"
+    version = "0.0.1"
+
+    def __init__(
+        self,
+        urlpath,
+        sheet_name="Global Carbon Budget",
+        header=21,
+        index_col="Year",
+        skipfooter=4,
+        metadata=None,
+    ):
+        """Initialize Excel source.
+
+        Args:
+            urlpath: URL or simplecache path to Excel file
+            sheet_name: Name of sheet to read
+            header: Row number to use as header (0-indexed)
+            index_col: Column to use as index
+            skipfooter: Number of rows to skip at end
+            metadata: Additional metadata
+        """
+        super().__init__(metadata=metadata)
+        self.urlpath = urlpath
+        self.sheet_name = sheet_name
+        self.header = header
+        self.index_col = index_col
+        self.skipfooter = skipfooter
+
+    def _get_schema(self):
+        return intake.source.base.Schema(
+            datatypes={"_": "python"},
+            shape=(None, None),
+            npartitions=1,
+            metadata=self.metadata,
+        )
+
+    def _load(self):
+        import fsspec
+        import pandas as pd
+
+        fs, _token, paths = fsspec.get_fs_token_paths(self.urlpath)
+        path = paths[0]
+        with fs.open(path, "rb") as f:
+            return pd.read_excel(
+                io.BytesIO(f.read()),
+                sheet_name=self.sheet_name,
+                header=self.header,
+                index_col=self.index_col,
+                skipfooter=self.skipfooter,
+            )
+
+    def read(self):
+        return self._load()
+
+    def _close(self):
+        pass
+
+
+intake.source.register_driver("excel_url", ExcelSource)